github-actions: Bump shivammathur/setup-php from 2.31.0 to 2.31.1 #1257

Job	Run time
Validate composer (8.1, highest)	9s
Linting (8.1)	21s
Linting (8.2)	16s
Linting (8.3)	15s
Check Coding Standards with PHPCS (8.1, highest)	21s
Check for Backward Compatibility breaks (8.1, highest)	23s
Install dependencies (8.1, lowest, false)	37s
Static Code Analysis with PHPStan (8.1, locked)	18s
UnitTests with PHPUnit (8.1, highest)	14s
Install dependencies (8.1, highest, false)	14s
Static Code Analysis with PHPStan (8.2, locked)	22s
UnitTests with PHPUnit (8.2, highest)	13s
Static Code Analysis with PHPStan (8.3, locked)	16s
Install dependencies (8.2, lowest, false)	12s
UnitTests with PHPUnit (8.3, highest)	11s
Install dependencies (8.2, highest, false)	21s
Install dependencies (8.3, lowest, false)	29s
Install dependencies (8.3, highest, false)	13s
Install dependencies (8.1, locked, false)	23s
Install dependencies (8.2, locked, false)	16s
Install dependencies (8.3, locked, false)	20s
Install dependencies (8.4, highest, true)	13s
Compare results with PHPUnit (8.1, highest)	17s
Code Coverage with PHPUnit (8.1, highest)	22s
Compare results with PHPUnit (8.2, highest)	22s
Code Coverage with PHPUnit (8.2, highest)	15s
Compare results with PHPUnit (8.3, highest)	19s
Code Coverage with PHPUnit (8.3, highest)	16s
	8m 28s

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