ci: update to Ubuntu 22.04 and macOS 12

Testing against newer versions will help us keep abreast of any upcoming
issues. The older versions can be added as partial matrix entries if
desirable, but I do not believe this to be necessary.

Also re-order mypy in the workflow so that type errors fail fast (before
tests are run).

.github/workflows/main.yml

@@ -31,11 +31,11 @@ jobs:
         python-version: ["3.7", "3.8", "3.9", "3.10"]
         include:
           - os: Ubuntu
-            image: ubuntu-latest
+            image: ubuntu-22.04
           - os: Windows
             image: windows-2022
           - os: macOS
-            image: macos-11
+            image: macos-12
       fail-fast: false
     defaults:
       run:
@@ -81,15 +81,15 @@ jobs:
       - name: Install dependencies
         run: poetry install
 
+      - name: Run mypy
+        run: poetry run mypy
+
       - name: Install pytest plugin
         run: poetry run pip install pytest-github-actions-annotate-failures
 
       - name: Run pytest
         run: poetry run python -m pytest -p no:sugar -q tests/
 
-      - name: Run mypy
-        run: poetry run mypy
-
       - name: Run pytest (integration suite)
         env:
           POETRY_TEST_INTEGRATION_GIT_USERNAME: ${GITHUB_ACTOR}