Release 2.16.1

- [FEATURE] Use "no-progress timeout" after which connection is closed.
- [BUGFIX] Select new SCID when current SCID is retired.
- [BUGFIX] Don't warn about dropped Initial packet sequence gaps during
  mini/full handoff.
- [BUGFIX] Send correct conn error when HTTP/3 frame is truncated.
- [BUGFIX] Mini conn: consider amplification when deciding to return
  TICK_SEND.
- [BUGFIX] Don't double-count tag length in amplification logic.
- [BUGFIX] Don't squeeze out lone path challenges.
- [BUGFIX] Log messages dealing with scheduled packet queue squeezing.
- [BUGFIX] don't wipe current path if no path challenge responses
  come back.
- [BUGFIX] When path is reset, don't lose path_id which is used for
  logging.
- Downgrade flow control violations to info log level from warnings.
- Fix connection cap extra check, avoid checks in nested calls.
- Fix some unit tests when extra checks are enabled.
- Use ls-hpack 2.2.1.
- Turn off unconditional extra checks for IETF clients.
- Extra checks: don't verify sent size of hello packets.  Client
  changes DCID length and this check will fail.

tests/test_bw_sampler.c

@@ -79,6 +79,7 @@ sampler_test_send_packet (struct sampler_test *stest, lsquic_packno_t packno,
     memset(packet_out, 0, sizeof(*packet_out));
     packet_out->po_packno = packno;
     packet_out->po_flags |= PO_SENT_SZ;
+    packet_out->po_flags |= PO_HELLO;   /* Bypass sanity check */
     packet_out->po_sent_sz = kRegularPacketSize;
     packet_out->po_sent = stest->time;
     if (retx)