Update importlib-metadata requirement from <8,>=4 to >=8.0.0,<9

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@v4.0.0...v8.0.0)

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

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

pyproject.toml

@@ -29,7 +29,7 @@ dependencies = [
     "diskcache~=5.4",
     "fasteners~=0.19.0",
     "h5py~=3.6",
-    "importlib-metadata>=4,<8",
+    "importlib-metadata>=8.0.0,<9",
     "ir-datasets~=0.4",
     "joblib~=1.0",
     "lz4~=4.0",