build(deps): update brotli requirement from 3 to 6

[dependabot[bot]]

Updates the requirements on brotli to permit the latest version.

Commits

• 8e0b2a8 fix CI
• bf3db20 Minor hq.rs cleanup
• 10083bf Cleanup BlockSplitIterator
• f53535a Remove dead code
• d1f356c Remove unused corrosion code
• f8f5840 Refactor encode::set_parameter
• f1dad22 Use proper self for Command and related
• 2c601f4 Release 5.0.0 with ffi-api disabled by default to avoid ODR issues
• 6c4cd18 Make hex numbers more readable
• 2ff7b21 Use proper self for BrotliEncoderStateStruct
• Additional commits viewable in compare view

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