Bump phpstan/phpstan from 1.12.5 to 1.12.6 #466

Job	Run time
Coding Standards	13s
Code Coverage / Code Coverage	21s
Lint root / Lint yaml & Composer (8.2)	13s
Dependency analysis / Dependency Analysis (8.2)	23s
Static analysis / Static Code Analysis (8.2)	43s
Unit test / Supported Versions Matrix	7s
Unit test / Tests (8.1, lowest)	35s
Unit test / Tests (8.1, locked)	26s
Unit test / Tests (8.1, highest)	23s
Unit test / Tests (8.2, lowest)	27s
Unit test / Tests (8.2, locked)	12s
Unit test / Tests (8.2, highest)	37s
Unit test / Tests (8.3, lowest)	28s
Unit test / Tests (8.3, locked)	39s
Unit test / Tests (8.3, highest)	1m 8s
Integration test / Supported Versions Matrix	3s
Integration test / Tests (8.1, lowest)	18s
Integration test / Tests (8.1, locked)	12s
Integration test / Tests (8.1, highest)	19s
Integration test / Tests (8.2, lowest)	17s
Integration test / Tests (8.2, locked)	16s
Integration test / Tests (8.2, highest)	19s
Integration test / Tests (8.3, lowest)	32s
Integration test / Tests (8.3, locked)	10s
Integration test / Tests (8.3, highest)	17s
	9m 38s

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