Fix CI Failures

[Darshan808]

Fixes #470

This PR addresses CI failures that have been affecting recent pull requests.

1. Python 3.8 Hatch Installation Failure

TypeError: 'type' object is not subscriptable
Error installing hatch.

• The CI matrix was using "3.8", but modern versions of hatch and its dependencies require Python 3.9+
• Changed "3.8" to "3.9" in the test matrix

2. Unused Type Ignore Comment

Removed the unused # type: ignore comment that is no longer needed.

3. Deprecated Ubuntu Runner Causing Job Stalls

• Some jobs were stalling with Waiting for a runner to pick up this job... because it was using the deprecated ubuntu-20.04 runner.
• Updated CodeQL workflow to use ubuntu-latest (currently ubuntu-22.04) for reliable runner availability.

[Darshan808]

The license workflow is still using ubuntu-20.04 because it uses pull_request_target, which runs the workflow from main branch.

Once this PR is merged, future PRs will use the updated ubuntu-latest version.

[krassowski]

Thank you @Darshan808!