* test: Strip whitespace when comparing numpy dtypes for 1.22 compat

Strip whitespace when comparing numpy dtype str() in order to preserve
test compatibility with both numpy 1.22 and older versions whose output
differ by whitespace.

Fixes #3680

* [pre-commit.ci] auto fixes from pre-commit.com hooks

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* docs: update changelog for 2.9.1

* Update changelog.rst

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* Update changelog.rst

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* Fix optimization bug introduced in #3650

* Add simple Python extension test for MVF

* Improve comments

* Clarify comment

* Clarify another comment

* Add test docstring

* Fix typo

* fix: support conda-forge

* Update setup.py

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* Fix module extension detection for python 3.10

* Fix for python < 3.10

* Use importlib

* Add tests demonstrating smart_holder issues with multiple inheritance

* Propagate C++ multiple inheritance markers to all children

- Makes py::multiple_inheritance only needed in base classes hidden from pybind11

* msys ci: un-pin setup-msys2 action version

* msys ci: explicitly set PYTHONHOME and PYTHONPATH for c++ and interface tests (to workaround https://github.com/msys2/setup-msys2/issues/167)

Fix a typo in class.rst

Bumps [jwlawson/actions-setup-cmake](https://github.com/jwlawson/actions-setup-cmake) from 1.11 to 1.12.
- [Release notes](https://github.com/jwlawson/actions-setup-cmake/releases)
- [Commits](https://github.com/jwlawson/actions-setup-cmake/compare/v1.11...v1.12)

---
updated-dependencies:
- dependency-name: jwlawson/actions-setup-cmake
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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* Render `py::bool_` as `bool` in docstrings

* Render `py::float_` as `float` in docstrings

Typo introduced with PR #2377.

Adopting fix from @AWhetter PR #2621 (to keep unrelated changes cleanly separated).

* Add support for nested C++11 exceptions

* Remove wrong include

* Fix if directive

* Fix missing skipif

* Simplify code and try to work around MSVC bug

* Clarify comment

* Further simplify code

* Remove the last extra throw statement

* Qualify auto

* Fix typo

* Add missing return for consistency

* Fix clang-tidy complaint

* Fix python2 stub

* Make clang-tidy happy

* Fix compile error

* Fix python2 function signature

* Extract C++20 utility and backport

* Cleanup code a bit more

* Improve test case

* Consolidate code and fix signature

* Fix typo

* A way to register additional test targets.

* Support specifying tests with extension.

* Ensure TEST_OVERRIDE is backwards compatible.

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* Ensure regex is non greedy.

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* Remove deprecated c-headers

* Update calls to old cfunctions

* Add missing one

* Add another missing one

* Replacing ICC C++14 with C++17

* ICPC: -diag-disable:conversion

Try to suppress the `-Werror-all` promotion in `#include <variant>`

* Trying `-DPYBIND11_WERROR=OFF`

* Trying `-Wno-conversion` (todo: make specific to C++17 if it works)

* Inserting -Wno-conversion only for C++17

Co-authored-by: Axel Huebl <axel.huebl@plasma.ninja>

* Add additional info to TypeInfo when C++->Python casting fails

* Fix typo

* Address reviewer comments

updates:
- [github.com/pre-commit/mirrors-mypy: v0.930 → v0.931](https://github.com/pre-commit/mirrors-mypy/compare/v0.930...v0.931)

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Bumps [pypa/gh-action-pypi-publish](https://github.com/pypa/gh-action-pypi-publish) from 1.4.2 to 1.5.0.
- [Release notes](https://github.com/pypa/gh-action-pypi-publish/releases)
- [Commits](https://github.com/pypa/gh-action-pypi-publish/compare/v1.4.2...v1.5.0)

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updates:
- [github.com/asottile/pyupgrade: v2.29.1 → v2.31.0](https://github.com/asottile/pyupgrade/compare/v2.29.1...v2.31.0)

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* Adding dedicated test_const_name.

Also exercises pybind11::detail::_ backward compatibility.

See also: PR #3423

* Backing out tests involving int_to_str (requires C++17 or higher).

* Suppressing clang-tidy errors.

* Disabling test_const_name for MSVC 2015 due to bizarre failures.

* Stacking @pytest.mark.parametrize (thanks to @skylion007 for pointing out).

updates:
- [github.com/pre-commit/pre-commit-hooks: v4.0.1 → v4.1.0](https://github.com/pre-commit/pre-commit-hooks/compare/v4.0.1...v4.1.0)
- [github.com/pre-commit/mirrors-mypy: v0.920 → v0.930](https://github.com/pre-commit/mirrors-mypy/compare/v0.920...v0.930)
- [github.com/shellcheck-py/shellcheck-py: v0.8.0.2 → v0.8.0.3](https://github.com/shellcheck-py/shellcheck-py/compare/v0.8.0.2...v0.8.0.3)

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* docs: update changelog

* Update changelog.rst

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* fix: avoid usage of _

* ci: test _ defined

* docs: include change in docs

* fix: add a test and comment

* refactor: const_str -> const_name

* Trivial change.

* Trying ICC Latest C++14 instead of C++17.

* Trying ICC Latest C++20 instead of C++17.

* Settling on ICC Latest C++14 for now.

* Undoing trivial change.

* ci: try using SETUPTOOLS_USE_DISTUTILS=stdlib

Co-authored-by: Henry Schreiner <HenrySchreinerIII@gmail.com>

updates:
- [github.com/pre-commit/mirrors-mypy: v0.910-1 → v0.920](https://github.com/pre-commit/mirrors-mypy/compare/v0.910-1...v0.920)
- [github.com/shellcheck-py/shellcheck-py: v0.8.0.1 → v0.8.0.2](https://github.com/shellcheck-py/shellcheck-py/compare/v0.8.0.1...v0.8.0.2)

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* Ensure ThreadPool is closed in setup_helpers

The ParallelCompile setup helper using a ThreadPool to enable its
parallelism. It does not properly close the pool when it is done with
it.
This can lead to a "Exception ignored in: <function Pool.__del__..."
message with traceback being printed at shutdown.
Use pool.terminate() instead of context manager for Python 2.7
compatibility

* Add note to remove code that supports Python 2

Co-authored-by: Bobby Impollonia <bobby@k13capital.com>