Revert checkout action to upstream

[kaidokert]

Upstream still hasn't patched the issue, but our builds seem to not trip on submodules at the moment.

b/282361986

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 58.56%. Comparing base (e91418d) to head (7cdcc6b).
Report is 1 commits behind head on main.

❗ Current head 7cdcc6b differs from pull request most recent head 59e4ff9

Please upload reports for the commit 59e4ff9 to get more accurate results.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2169      +/-   ##
==========================================
+ Coverage   57.99%   58.56%   +0.56%     
==========================================
  Files        1778     1909     +131     
  Lines       84836    94579    +9743     
==========================================
+ Hits        49204    55389    +6185     
- Misses      35632    39190    +3558     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[kaidokert]

This is blocked on node20 not running on our old Ubuntu. Will need a solution for that or Ubuntu containers update #3327