devel/pecl-event: update to 3.1.4 release (+)

What's new:

3.1.1 Fixed build in RHEL 7 and 8 (thanks to Remi Collet).
3.1.2 Fixed an issue in EventDnsBase::construct() where it failed to accept the init flag set to true when using libevent version < 2.1.0.
3.1.3 EventDnsBase::construct() now throws a TypeError if the type of the $initialize argument is anything other than int or bool.
3.1.4 Fixed tests failing with PHP 8.4.0-alpha1 (thanks to Remi Collet).