build(deps): update importlib-metadata requirement in /requirements

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@v8.5.0...v8.6.1)

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

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

requirements/gha-package.txt

@@ -2,4 +2,4 @@ twine ==6.0.*
 setuptools ==75.8.*
 wheel ==0.45.*
 build ==1.2.*
-importlib_metadata ==8.5.*
+importlib_metadata ==8.6.*