MNT: (deps): Update importlib-metadata requirement in /ci

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...v8.4.0)

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

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

ci/requirements.txt

@@ -3,4 +3,4 @@ numpy==1.21.5
 pandas==1.3.5
 protobuf==3.20.1
 requests==2.28.1
-importlib_metadata<5.0
+importlib_metadata<9.0