pkg/leakybucket: replace sycn.Map with map + mutex

[mmetc]

No description provided.

[github-actions]

@mmetc: There are no area labels on this PR. You can add as many areas as you see fit.

• /area agent
• /area local-api
• /area cscli
• /area appsec
• /area security
• /area configuration

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[codecov]

Codecov Report

❌ Patch coverage is 88.88889% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 63.08%. Comparing base (8a2eb8d) to head (2f41943).
⚠️ Report is 3 commits behind head on master.

Files with missing lines	Patch %	Lines
pkg/leakybucket/bucketstore.go	86.95%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           master    #4271       +/-   ##
===========================================
+ Coverage   36.06%   63.08%   +27.01%     
===========================================
  Files         471      472        +1     
  Lines       33438    33449       +11     
===========================================
+ Hits        12060    21100     +9040     
+ Misses      20014    10227     -9787     
- Partials     1364     2122      +758     

Flag	Coverage Δ
bats	46.60% <44.44%> (?)
unit-linux	35.96% <88.88%> (-0.03%)	⬇️
unit-windows	24.39% <88.88%> (-0.01%)	⬇️

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[sabban]

lgtm