trillium-http-v1.3.4

What's Changed

Added

• Body now supports Arc<[u8]> and Arc<str> fixed-length content via From conversions, for
  cheaply-cloneable shared bodies that don't require &'static borrowing or per-send Vec clones.

Changed

• Reduced per-response heap allocations across HTTP/1.x, HTTP/2, and HTTP/3, concentrated in
  response-header encoding. Steady-state response encoding now allocates several fewer times per
  HTTP/2 and HTTP/3 response. Behavior and public API are unchanged.