Update importlib-metadata requirement from ~=4.0 to ~=6.8

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...v6.8.0)

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

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

pyproject.toml

@@ -16,7 +16,7 @@ classifiers = [
 dependencies = [
     "click~=8.1",
     "gspread~=5.11",
-    "importlib-metadata~=4.0",
+    "importlib-metadata~=6.8",
     "jupyter~=1.0",
     "jupyterlab~=4.0",
     "matplotlib~=3.8",