run specs on ruby 3.1 and remove 2.5 support

[kasif-adnan]

Description

This PR drops ruby 2.5 support and adds 3.1 support

Issues Resolved

List any existing issues this PR resolves

Check List

• [ ] All tests pass. See TESTING.md for details.
• [ ] New functionality includes testing.
• [ ] New functionality has been documented in the README if applicable.