add importlib_metadata for mypy pre-commit hook

Author: RonnyPfannschmidt

.pre-commit-config.yaml

@@ -41,3 +41,4 @@ repos:
             - types-setuptools
             - tokenize-rt==3.2.0
             - pytest == 7.1
+            - importlib_metadata

src/setuptools_scm/_entrypoints.py

@@ -70,7 +70,7 @@ def _version_from_entrypoints(
 try:
     from importlib.metadata import entry_points  # type: ignore
 except ImportError:
-    from importlib_metadata import entry_points  # type: ignore
+    from importlib_metadata import entry_points
 
 
 def iter_entry_points(