GHSA-4MH8-R7RC-XPVC fastify vulnerable to Denial of Service via unhandled exception on HTTP/2 trailer responses

Impact fastify crashes with an uncaught ERRHTTP2INVALIDCONNECTIONHEADERS exception when a route that registers a response trailer via reply.trailer is served over HTTP/2. Fastify unconditionally adds the Transfer-Encoding: chunked header when a trailer is set, which is forbidden on HTTP/2, so...