GCC incorrect warning

[ripatel-fd]

Incorrect stringop-overflow check breaks build on some GCC versions.
Release blocker

In function 'fd_quic_key_update_complete',
    inlined from 'fd_quic_handle_v1_one_rtt' at src/waltz/quic/fd_quic.c:2126:5:
src/waltz/quic/fd_quic.c:2043:3: error: 'fd_quic_key_update_derive' accessing 88 bytes in a region of size 16 [-Werror=stringop-overflow=]
 2043 |   fd_quic_key_update_derive( &conn->secrets, conn->new_keys );
      |   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

[ripatel-fd]

Fixed in #3753