fix: pin actions versions in cta-transitions.yml

[JoshuaKGoldberg]

PR Checklist

• Addresses an existing open issue: fixes 🐛 Bug: CTA Transitions action doesn't preserve existing uses pins #2038
• That issue was marked as status: accepting prs
• Steps in CONTRIBUTING.md were taken

Overview

🎁

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.81%. Comparing base (ecf8ee2) to head (da1e5ed).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2054   +/-   ##
=======================================
  Coverage   99.81%   99.81%           
=======================================
  Files         120      120           
  Lines        4973     4981    +8     
  Branches      313      313           
=======================================
+ Hits         4964     4972    +8     
  Misses          9        9           

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[github-actions]

🎉 This is included in version v2.17.1 🎉

The release is available on:

• GitHub releases
• npm package (@latest dist-tag)

Cheers! 📦🚀