Build/Test Tools: Upgrade PHPStan to version 2.2.2. #5637

Job	Run time
Determine Matrix	0s
Slack Notifications	-1s
${{ ((matrix.multisite && 'Multisite') \|\| 'Single Site') }} ${{ ((matrix.memcached && 'Memcached') \|\| 'Default') }}	-1s
matrix.label	-1s
Failed workflow tasks	-1s
	-4s

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