Update brotli dependency and bump version to 11.3.0

[SeriousBug]

Summary

• Updated brotli dependency from 6.0 to 8.0.2 in both root and impl crates
• Bumped package version to 11.3.0 across all workspace crates
• All tests pass, including brotli compression roundtrip tests

This release includes:

• The recently merged zstd compression support (Add zstd compression support #18)
• Updated brotli dependency (major version update from 6.0 to 8.0.2)

Test plan

• Run full test suite with cargo test
• Run compression-specific tests with features enabled
• Verify brotli compression roundtrip test passes
• Verify build succeeds with new versions

🤖 Generated with Claude Code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 79.46%. Comparing base (f64892d) to head (e1b9ebf).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #19      +/-   ##
==========================================
+ Coverage   73.29%   79.46%   +6.17%     
==========================================
  Files           9        9              
  Lines         498      448      -50     
==========================================
- Hits          365      356       -9     
+ Misses        133       92      -41     

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