Update importlib-metadata requirement from <7.3 to <8.1

Updates the requirements on [importlib-metadata](https://github.com/python/importlib_metadata) to permit the latest version.
- [Release notes](https://github.com/python/importlib_metadata/releases)
- [Changelog](https://github.com/python/importlib_metadata/blob/main/NEWS.rst)
- [Commits](python/importlib_metadata@0.1...v8.0.0)

---
updated-dependencies:
- dependency-name: importlib-metadata
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

test_reqs.txt

@@ -18,7 +18,7 @@ pyflakes==3.2.0
 pytz==2024.1
 configparser==7.0.0
 zipp==3.19.2
-importlib-metadata<7.3 # for flake8
+importlib-metadata<8.1 # for flake8
 entrypoints==0.4
 typing_extensions==4.12.2
 pyparsing==3.1.2