ssl/quic/quic_ackm.c: fix unhandled memory failure in tx pkt history map insert

ssl/quic/quic_ackm.c: fix unhandled memory failure in tx pkt history map insert

This can cause error when freeing txpim as it can be still in use so the
assert in it fails.

Fixes: fa4e92a70a5f "QUIC ACK Manager, Statistics Manager and Congestion Control API"
Reviewed-by: Saša Nedvědický <sashan@openssl.org>
Reviewed-by: Nikola Pajkovsky <nikolap@openssl.org>
Reviewed-by: Eugene Syromiatnikov <esyr@openssl.org>
MergeDate: Tue May 26 09:59:05 2026
(Merged from https://github.com/openssl/openssl/pull/31258)