Bump phpstan/phpstan from 1.12.7 to 1.12.8 #96

Job	Run time
BC Check	10s
Code Coverage / Code Coverage	20s
Coding Standards / Coding Standards (8.0)	25s
Dependency analysis / Dependency Analysis (8.0)	20s
Lint root / Lint yaml & Composer (8.0)	8s
Static analysis / Static Code Analysis (8.0)	19s
Unit test / Supported Versions Matrix	2s
Unit test / Tests (7.4, lowest)	26s
Unit test / Tests (7.4, locked)	23s
Unit test / Tests (7.4, highest)	14s
Unit test / Tests (8.0, lowest)	29s
Unit test / Tests (8.0, locked)	17s
Unit test / Tests (8.0, highest)	16s
Unit test / Tests (8.1, lowest)	15s
Unit test / Tests (8.1, locked)	11s
Unit test / Tests (8.1, highest)	32s
Unit test / Tests (8.2, lowest)	27s
Unit test / Tests (8.2, locked)	14s
Unit test / Tests (8.2, highest)	29s
Unit test / Tests (8.3, lowest)	17s
Unit test / Tests (8.3, locked)	12s
Unit test / Tests (8.3, highest)	27s
Unit test / Tests (8.4, lowest)	28s
Unit test / Tests (8.4, locked)	11s
Unit test / Tests (8.4, highest)	33s
	8m 5s

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