Support for 2.17.3 #100

Job	Run time
PHPUnit tests (lowest, 7.4, ubuntu-latest)	10s
PHPUnit tests (lowest, 7.4, windows-latest)	9s
PHPUnit tests (lowest, 8.0, ubuntu-latest)	9s
PHPUnit tests (lowest, 8.0, windows-latest)	1s
PHPUnit tests (lowest, 8.1, ubuntu-latest)	1s
PHPUnit tests (lowest, 8.1, windows-latest)	1s
PHPUnit tests (lowest, 8.2, ubuntu-latest)	1s
PHPUnit tests (lowest, 8.2, windows-latest)	1s
PHPUnit tests (highest, 7.4, ubuntu-latest)	13s
PHPUnit tests (highest, 7.4, windows-latest)	7s
PHPUnit tests (highest, 8.0, ubuntu-latest)	17s
PHPUnit tests (highest, 8.0, windows-latest)	6s
PHPUnit tests (highest, 8.1, ubuntu-latest)	9s
PHPUnit tests (highest, 8.1, windows-latest)	10s
PHPUnit tests (highest, 8.2, ubuntu-latest)	11s
PHPUnit tests (highest, 8.2, windows-latest)	8s
PHPUnit tests (locked, 7.4, ubuntu-latest)	9s
PHPUnit tests (locked, 7.4, windows-latest)	10s
PHPUnit tests (locked, 8.0, ubuntu-latest)	15s
PHPUnit tests (locked, 8.0, windows-latest)	10s
PHPUnit tests (locked, 8.1, ubuntu-latest)	15s
PHPUnit tests (locked, 8.1, windows-latest)	11s
PHPUnit tests (locked, 8.2, ubuntu-latest)	14s
PHPUnit tests (locked, 8.2, windows-latest)	10s
	3m 28s

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