Store *[]byte in bufferPool to avoid allocation on Put

[asnyatkov]

Description

sync.Pool boxes values into any (interface{}). Storing []byte directly causes the 24-byte slice header to be heap-allocated on every Put(). Storing *[]byte avoids this since the pointer is already on the heap.

This is the same pattern used in Go stdlib (fmt.pp, encoding/json).

[codecov]

Codecov Report

❌ Patch coverage is 66.66667% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 82.42%. Comparing base (4bcdae3) to head (34d24cd).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
session_srtcp.go	60.00%	1 Missing and 1 partial ⚠️
session_srtp.go	71.42%	1 Missing and 1 partial ⚠️

❌ Your patch status has failed because the patch coverage (66.66%) is below the target coverage (70.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #368      +/-   ##
==========================================
- Coverage   82.63%   82.42%   -0.22%     
==========================================
  Files          19       19              
  Lines        1457     1462       +5     
==========================================
+ Hits         1204     1205       +1     
- Misses        140      142       +2     
- Partials      113      115       +2     

Flag	Coverage Δ
go	82.42% <66.66%> (-0.22%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.