ci: pin ubuntu to 22.04 (#513)

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->

## Summary by CodeRabbit

- **Chores**
- Updated GitHub Actions workflow to run tests on Ubuntu 22.04
specifically
- Refined testing infrastructure to use a consistent operating system
environment

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

Signed-off-by: Jinzhe Zeng <jinzhe.zeng@rutgers.edu>

Author: njzjz

.github/workflows/test.yml

@@ -16,7 +16,7 @@ jobs:
           - '3.11'
           - '3.12'
         platform:
-          - ubuntu-latest
+          - ubuntu-22.04
           - macos-latest
           - windows-latest
         exclude:  # Apple Silicon ARM64 does not support Python < v3.8