security/easy-rsa: report weak build-ca crypto on CA private keys

By adding to UPDATING and pkg-message, and bumping PORTREVISION so
as to trigger updates that show these messages so that
easyrsa users can re-encrypt their CA private keys with AES instead of
Triple-DES.

It is pointless to add vuln.xml, supported port branch versions,
main and 2025Q1, already carry a bugfixed Easy-RSA version.

Reported by: pkelsey@
Security: CVE-2024-13454
MFH: 2025Q1