Upgrade to latest mypy

.pre-commit-config.yaml

@@ -8,7 +8,7 @@ repos:
       - id: trailing-whitespace
 
   - repo: https://github.com/pre-commit/mirrors-mypy
-    rev: v0.950
+    rev: v0.991
     hooks:
       - id: mypy
         exclude: '^(docs|tasks|tests)|setup\.py'

src/packaging/specifiers.py

@@ -252,7 +252,8 @@ def __init__(self, spec: str = "", prereleases: Optional[bool] = None) -> None:
         # Store whether or not this Specifier should accept prereleases
         self._prereleases = prereleases
 
-    @property
+    # https://github.com/python/mypy/pull/13475#pullrequestreview-1079784515
+    @property  # type: ignore[override]
     def prereleases(self) -> bool:
         # If there is an explicit prereleases set for this, then we'll just
         # blindly use that.

src/packaging/tags.py

@@ -111,7 +111,7 @@ def parse_tag(tag: str) -> FrozenSet[Tag]:
 
 
 def _get_config_var(name: str, warn: bool = False) -> Union[int, str, None]:
-    value = sysconfig.get_config_var(name)
+    value: Union[int, str, None] = sysconfig.get_config_var(name)
     if value is None and warn:
         logger.debug(
             "Config variable '%s' is unset, Python ABI tag may be incorrect", name