GHSA-CP4Q-FQW9-4HF6 Http4s Ember HTTP/2: unbounded continuation frame accumulation

When Ember receives an HTTP/2 HEADERS or PUSHPROMISE frame without the ENDHEADERS flag, it buffers the header block fragment and waits for subsequent CONTINUATION frames. These accumulate unbounded until the connection closes. Impact A remote, unauthenticated peer can exhaust the heap on any Embe...