Bump phpstan/phpstan from 1.12.7 to 1.12.8 #476

Job	Run time
Coding Standards	23s
Lint root / Lint yaml & Composer (8.2)	10s
Dependency analysis / Dependency Analysis (8.2)	23s
Code Coverage / Code Coverage	23s
Static analysis / Static Code Analysis (8.2)	34s
Unit test / Supported Versions Matrix	10s
Unit test / Tests (8.1, lowest)	33s
Unit test / Tests (8.1, locked)	18s
Unit test / Tests (8.1, highest)	55s
Unit test / Tests (8.2, lowest)	35s
Unit test / Tests (8.2, locked)	17s
Unit test / Tests (8.2, highest)	55s
Unit test / Tests (8.3, lowest)	29s
Unit test / Tests (8.3, locked)	24s
Unit test / Tests (8.3, highest)	32s
Integration test / Supported Versions Matrix	6s
Integration test / Tests (8.1, lowest)	31s
Integration test / Tests (8.1, locked)	17s
Integration test / Tests (8.1, highest)	25s
Integration test / Tests (8.2, lowest)	33s
Integration test / Tests (8.2, locked)	12s
Integration test / Tests (8.2, highest)	19s
Integration test / Tests (8.3, lowest)	20s
Integration test / Tests (8.3, locked)	13s
Integration test / Tests (8.3, highest)	37s
	10m 34s

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