lang/php74{-extensions}: Mark DEPRECATED

Security support for php74 will expire on 28th November, 2022. For
details please see:
https://www.php.net/supported-versions

EXPIRATION_DATE has been set 1 day after the EOL.

A metabug has been created to track which ports explicitly depends on
php74{-extensions} only; which is available at:
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=261604

PR: 261604
Approved by: tz (private email)
Sponsored by: Bounce Experts