fix: restore regeneration

[JoeWang1127]

Fixes #4288

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.85%. Comparing base (04292c6) to head (c4b830b).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4292   +/-   ##
=======================================
  Coverage   94.85%   94.85%           
=======================================
  Files         187      187           
  Lines        7194     7194           
=======================================
  Hits         6824     6824           
  Misses        370      370           

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[JoeWang1127]

Filed issue for failure in generating google-cloud-compute-v1: googleapis/librarian#3575

[coryan]

Filed issue for failure in generating google-cloud-compute-v1: googleapis/librarian#3575

I suspect google-cloud-compute-v1 now needs a source-root override.