lib: use bracket notation instead of String.prototype.startWith for locks

[kimtaejin3]

Use StringPrototypeStartsWith from primordials instead of String.prototype.startsWith to prevent prototype pollution.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.78%. Comparing base (5d39030) to head (7176d5a).
⚠️ Report is 10 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #61492      +/-   ##
==========================================
- Coverage   89.82%   89.78%   -0.04%     
==========================================
  Files         667      672       +5     
  Lines      203693   203908     +215     
  Branches    39163    39194      +31     
==========================================
+ Hits       182963   183076     +113     
- Misses      13061    13161     +100     
- Partials     7669     7671       +2     

Files with missing lines	Coverage Δ
lib/internal/locks.js	95.10% <100.00%> (+0.01%)	⬆️

... and 44 files with indirect coverage changes

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[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/70984/

[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/71005/