Fix gosec slice bounds warnings

[asayyah]

Add nolint directives for safe slice accesses where bounds are guaranteed by fixed-size allocation or loop conditions.

[codecov]

Codecov Report

❌ Patch coverage is 88.88889% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 77.74%. Comparing base (99b388f) to head (d072ebe).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
receiver_estimated_maximum_bitrate.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #213      +/-   ##
==========================================
+ Coverage   77.07%   77.74%   +0.67%     
==========================================
  Files          22       22              
  Lines        2569     2022     -547     
==========================================
- Hits         1980     1572     -408     
+ Misses        493      354     -139     
  Partials       96       96              

Flag	Coverage Δ
go	77.74% <88.88%> (+0.67%)	⬆️

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