Update importlib-metadata requirement in the test group

Updates the requirements on [importlib-metadata](https://github.com/python/importlib_metadata) to permit the latest version.

Updates `importlib-metadata` to 9.0.0
- [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...v9.0.0)

---
updated-dependencies:
- dependency-name: importlib-metadata
  dependency-version: 9.0.0
  dependency-type: direct:development
  dependency-group: test
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

pyproject.toml

@@ -44,7 +44,7 @@ dev = [
   { include-group = "test" },
 ]
 test = [
-  "importlib-metadata<9.0",
+  "importlib-metadata<10.0",
   # Pytest for running the tests.
   "pytest==9.*",
   "pytest-cov==7.*",