composer(deps-dev): bump phpstan/phpstan from 1.12.7 to 1.12.8 #4054

Job	Run time
Coding Standards (8.1, locked)	25s
Backward-Compatibility Analysis (8.1, locked)	19s
Code Coverage (8.1, locked)	19s
Dependency Analysis (8.1, locked)	20s
Mutation Tests (8.1, locked)	42s
Refactoring (8.1, locked)	22s
Security Analysis (8.1, locked)	14s
Static Code Analysis (8.1, locked)	40s
Tests (8.1, lowest)	18s
Tests (8.1, locked)	14s
Tests (8.1, highest)	17s
Tests (8.2, lowest)	25s
Tests (8.2, locked)	22s
Tests (8.2, highest)	20s
Tests (8.3, lowest)	20s
Tests (8.3, locked)	25s
Tests (8.3, highest)	20s
	6m 22s

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