refactor: ensure garbage collection of objects using lru cache

Decorating class instances methods using `lru_cache` prevents garbage collection
to happen when an object gets deleted. This could be really bad for memory
consumption.
Some resources about this:
- https://rednafi.github.io/reflections/dont-wrap-instance-methods-with-functoolslru_cache-decorator-in-python.html
- https://www.youtube.com/watch?v=sVjtp6tGo0g

Originally spotted by rule `B019` of `flake8-bugbear`.

src/poetry/mixology/term.py

@@ -23,6 +23,8 @@ class Term:
     def __init__(self, dependency: Dependency, is_positive: bool) -> None:
         self._dependency = dependency
         self._positive = is_positive
+        self.relation = functools.lru_cache(maxsize=None)(self._relation)
+        self.intersect = functools.lru_cache(maxsize=None)(self._intersect)
 
     @property
     def inverse(self) -> Term:
@@ -48,8 +50,7 @@ class Term:
             and self.relation(other) == SetRelation.SUBSET
         )
 
-    @functools.lru_cache(maxsize=None)
-    def relation(self, other: Term) -> str:
+    def _relation(self, other: Term) -> str:
         """
         Returns the relationship between the package versions
         allowed by this term and another.
@@ -111,8 +112,7 @@ class Term:
                 # not foo ^1.5.0 is a superset of not foo ^1.0.0
                 return SetRelation.OVERLAPPING
 
-    @functools.lru_cache(maxsize=None)
-    def intersect(self, other: Term) -> Term | None:
+    def _intersect(self, other: Term) -> Term | None:
         """
         Returns a Term that represents the packages
         allowed by both this term and another

src/poetry/utils/authenticator.py

@@ -104,6 +104,9 @@ class Authenticator:
             if not disable_cache
             else None
         )
+        self.get_repository_config_for_url = functools.lru_cache(maxsize=None)(
+            self._get_repository_config_for_url
+        )
 
     @property
     def cache(self) -> FileCache | None:
@@ -351,8 +354,7 @@ class Authenticator:
             self._certs[url] = self._get_certs_for_url(url)
         return self._certs[url]
 
-    @functools.lru_cache(maxsize=None)
-    def get_repository_config_for_url(
+    def _get_repository_config_for_url(
         self, url: str, exact_match: bool = False
     ) -> AuthenticatorRepositoryConfig | None:
         parsed_url = urllib.parse.urlsplit(url)