fix(http): correct brotli decompressor buffer capacity to 8 KiB

[Sruhvx-jpg]

Summary

Fixes the misaligned 8_096 buffer capacity typo in actix_http::encoding::Decoder when initializing the Brotli decompressor writer, replacing it with DEFAULT_DECODER_CAPACITY = 8 * 1024 (8 KiB) to ensure clean virtual memory page and allocator size-class alignment.

Context

• In actix-http/src/encoding/decoder.rs, 8_096 was passed to brotli::DecompressorWriter::new().
• Standard system memory pages are 4 KiB (4,096 bytes), making 8,192 a clean 2-page power-of-two boundary ( \times 1024$). 8_096 was an accidental typo for 8192 (,192 - 96$).
• The encoding module elsewhere already standardizes on 8 KiB (e.g. Writer pre-allocates 8 KiB) and 32 KiB (encoder.rs).

Stacked PR Note

This PR is kept strictly minimal (~6 lines) to make review trivial. A stacked PR adding comprehensive unit test coverage for Decoder across sub-page, boundary, and multi-page chunks is ready and will follow right on top of this.

---

Note: Burned my hand today so typing is a bit slow, will submit the other audited fixes from the telemetry report tomorrow!