From http://httpd.apache.org/:

The Apache HTTP Server Project will only provide maintenance releases of the 2.2.x flavor through June of 2017, and will provide some security patches beyond this date through at least December of 2017.

So, you have at least 6 months to prepare for moving to version 2.4.x (or other HTTP server).

Also, according to https://perl.apache.org/download/, mod_perl_2.x is supported on Apache HTTP ver 2.4.x.

So, looks like you can migrate to Apache 2.4.x and keep using mod_perl 2.x