refactor: Simplify array copying

[alexandear]

Arrays in Go are value types, so clone.rateLimits = c.rateLimits copies all elements by value. It's equivalent to the copy call but without the [:] slice conversion overhead.

The [32]byte(slice) conversion is available since Go 1.20 and replaces the var declaration + copy with a single line.

[codecov]

Codecov Report

❌ Patch coverage is 25.00000% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 93.75%. Comparing base (5124fac) to head (2ab00a7).
⚠️ Report is 5 commits behind head on master.

Files with missing lines	Patch %	Lines
...xample/codespaces/newreposecretwithxcrypto/main.go	0.00%	1 Missing ⚠️
...xample/codespaces/newusersecretwithxcrypto/main.go	0.00%	1 Missing ⚠️
example/newreposecretwithxcrypto/main.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4143      +/-   ##
==========================================
+ Coverage   93.74%   93.75%   +0.01%     
==========================================
  Files         211      211              
  Lines       19685    19682       -3     
==========================================
  Hits        18453    18453              
+ Misses       1034     1031       -3     
  Partials      198      198              

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[gmlewis]

Thank you, @alexandear!
LGTM.
Merging.