Add PHPUnit 13 support (#30) #68

Job	Run time
analyse	19s
test (8.3)	9s
test (8.5)	13s
test (7.4)	13s
test (8.0)	10s
test (7.2)	15s
test (7.0, --prefer-stable --prefer-lowest)	34s
test (7.1)	11s
test (8.4)	10s
test (8.2)	13s
test (7.3)	13s
test (8.1)	11s
	2m 51s

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