Add importlib_metadata for python_version >= "3.12" in testing requirements

Author: Avasam

setup.cfg

@@ -72,6 +72,8 @@ testing =
 	# for tools/finalize.py
 	jaraco.develop >= 7.21; python_version >= "3.9" and sys_platform != "cygwin"
 	pytest-home >= 0.5
+	# No Python 3.12 dependencies require importlib_metadata, but needed for type-checking since we import it directly
+	importlib_metadata; python_version >= "3.12"
 
 testing-integration =
 	pytest