Use latest version of thredds test action

[tdrwenski]

Description of Changes

The GitHub action thredds-test-action's latest version is v2, which is what TDS uses. Update to v2 for netcdf-java as well.

PR Checklist

• [ ] Link to any issues that the PR addresses
• [ ] Add labels
• [ ] Open as a draft PR until ready for review
• [ ] Make sure GitHub tests pass
• [ ] Mark PR as "Ready for Review"