github: fixes warnings for unused variables

[kikofernandez]

Removes unused variables from script.

It was producing errors: https://github.com/erlang/otp/actions/runs/11837579763/job/32984873478

[github-actions[bot]]

CT Test Results

  1 files   11 suites   4m 21s :stopwatch:  93 tests  91 :white_check_mark: 2 :zzz: 0 :x: 109 runs  107 :white_check_mark: 2 :zzz: 0 :x:

Results for commit ca7f4efa.

:recycle: This comment has been updated with latest results.

To speed up review, make sure that you have read Contributing to Erlang/OTP and that all checks pass.

See the TESTING and DEVELOPMENT HowTo guides for details about how to run test locally.

Artifacts

• Complete CT logs (Download Logs)
• HTML Documentation (Download HTML Docs)
• Windows Installer

// Erlang/OTP Github Action Bot