remove executable bit on non-executable *.php files #868

Job	Run time
Get PHP versions to test	2s
check-translation (ubuntu-latest, 7.2)	24s
check-code (ubuntu-latest, 8.2)	2m 3s
test (ubuntu-latest, 8.0)	1m 5s
test (ubuntu-latest, 8.1)	41s
test (ubuntu-latest, 8.2)	43s
test (ubuntu-latest, 8.3)	56s
test (ubuntu-latest, 8.4)	50s
test (ubuntu-latest, 7.0)	1m 25s
test (ubuntu-latest, 7.1)	59s
test (ubuntu-latest, 7.2)	44s
test (ubuntu-latest, 7.3)	1m 4s
test (ubuntu-latest, 7.4)	1m 6s
test (ubuntu-latest, 5.6)	54s
	12m 56s

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