mail/fetchmail: update to 6.5.4

BUGFIXES:

• socket: avoid crash when writing to a socket without SSL/TLS fails. Reported by Andrea Venturoli via mailing list, fixes #71.
• wolfSSL support: avoid fetchmail.c compilation failure in certain configurations of wolfSSL (for instance, on FreeBSD's wolfssl-5.8.0_1 package), OpenSSL_version enables a newer 1.1.x compat API that passes its argument to a wolfSSL API, with OPENSSL_DIR and OPENSSL_ENGINES_DIR, causing related compiler failures.

PR: 287616
PR: 287435 (patch integrated upstream)
Approved by: Corey Halpin (maintainer)
MFH: 2025Q2