fix: set repo file perms after checkout in Version bump workflow

[kgpayne]

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📚 Documentation preview 📚: https://meltano-sdk--1280.org.readthedocs.build/en/1280/

[WillDaSilva]

Some small part of me hopes that this doesn't fix it, because this really shouldn't be necessary. That said, I do expect this will fix it.

[codecov]

Codecov Report

Merging #1280 (5d824b9) into main (67c0490) will not change coverage.
The diff coverage is n/a.

❗ Current head 5d824b9 differs from pull request most recent head b58155a. Consider uploading reports for the commit b58155a to get more accurate results

@@           Coverage Diff           @@
##             main    #1280   +/-   ##
=======================================
  Coverage   83.85%   83.85%           
=======================================
  Files          44       44           
  Lines        4150     4150           
  Branches      718      718           
=======================================
  Hits         3480     3480           
  Misses        490      490           
  Partials      180      180           

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