fix(worker): fix concurrent access problem of rand.Rand

[WisperDin]

fix issue: #693

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: +0.06 🎉

Comparison is base (d2ebeb0) 69.78% compared to head (195ca32) 69.85%.

❗ Current head 195ca32 differs from pull request most recent head 434c1f4. Consider uploading reports for the commit 434c1f4 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #694      +/-   ##
==========================================
+ Coverage   69.78%   69.85%   +0.06%     
==========================================
  Files          63       63              
  Lines       11954    11965      +11     
==========================================
+ Hits         8342     8358      +16     
+ Misses       2833     2832       -1     
+ Partials      779      775       -4     

Impacted Files	Coverage Δ
base/random.go	78.66% <0.00%> (-13.53%)	⬇️
worker/worker.go	67.13% <0.00%> (ø)

... and 3 files with indirect coverage changes

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[zhenghaoz]

/backport

[github-actions]

Successfully created backport PR for release-0.4:

• [Backport release-0.4] fix(worker): fix concurrent access problem of rand.Rand #696