Jetty 12-only (GHSA range 12.0.0-12.0.35 / 12.1.0-12.1.9). The leak is the
connection-scoped _trailers in Jetty 12's core internal/HttpConnection, which is never
reset. 10.0.26 has no such class: trailers live in HttpChannelOverHttp._trailers, and
HttpChannelOverHttp.recycle() sets them to null after every request (HttpConnection calls
_channel.recycle()). Request.recycle() also clears Request._trailers.