[General] Bump phpstan to level 4 and make it required for a build to pass

Review Request #1009 — Created July 8, 2023 and submitted — Latest diff uploaded

pprkut
Lunr
d6deaa4...
lunr

Bump phpstan to level 4 and make it required for a build to pass

GitHub actions run: https://github.com/pprkut/lunr/actions/runs/5494027734

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