[BREAKING CHANGE] Raise claimed PHP need from 7.2+ to 7.4+
[BREAKING CHANGE] Raise claimed PHP need from 7.2+ to 7.4+

We aren't testing in 7.2 or 7.3 any more, and they're EOL.

Change-Id: I1947c7271616626a660b508616a3c75b1517ad26

wikimedia/AhoCorasick,wikimedia/AhoCorasick