(CAT-648) - Mark release*.rb files as non-executable

[jordanbreen28]

Summary

Prior to this PR, the release.rb and release_spec.rb files were marked as executable. This was an error, and these files do not need to have these permissions. This PR updates the permissions of these files to match the other files found in the ./lib/pdk/cli and ./spec/unit/pdk/cli directories.

Additional Context

Add any additional context about the problem here.

• [ ] Root cause and the steps to reproduce. (If applicable)
• [ ] Thought process behind the implementation.

Related Issues (if any)

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Checklist

• [ ] 🟢 Spec tests.
• [ ] 🟢 Acceptance tests.
• [x] Manually verified.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 88.54%. Comparing base (da0a3b8) to head (fb4ecb8).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1378 +/- ## ======================================= Coverage 88.54% 88.54% ======================================= Files 127 127 Lines 5334 5334 ======================================= Hits 4723 4723 Misses 611 611 ```

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