fix locking the Base.require_lock when using Base loading functions

[KristofferC]

Required after JuliaLang/julia#59670

[aviatesk]

Thanks so much for fixing this.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.63%. Comparing base (f6c02d3) to head (956dca6).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #762   +/-   ##
=======================================
  Coverage   86.63%   86.63%           
=======================================
  Files          13       13           
  Lines        2949     2949           
=======================================
  Hits         2555     2555           
  Misses        394      394           

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