Temporarily stop running PHP-linter #222

Job	Run time
Linter	1m 25s
Quality control	44s
Security checks	22s
format('Unit tests, PHP {0}, {1}', matrix.php-versions, matrix.operating-system)	0s
format('Unit tests, PHP {0}, {1}', matrix.php-versions, matrix.operating-system)	-1s
Cleanup artifacts	0s
Code coverage	-1s
	2m 29s

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