chore(deps-dev): bump phpstan/phpstan from 1.12.5 to 1.12.6 #1756

Job	Run time
Integration tests on PHP 8.1	55s
Tests on PHP 8.1	32s
Backward Compatible Changes	5s
Integration tests on PHP 8.2	1m 5s
Tests on PHP 8.1 --prefer-lowest --prefer-stable	17s
Integration tests on PHP 8.3	1m 0s
Code quality	24s
Tests on PHP 8.2	33s
Tests on PHP 8.2 --prefer-lowest --prefer-stable	21s
Dependencies state	56s
Tests on PHP 8.3	16s
Mutation testing	1m 29s
Working Nix Shell	1m 14s
Tests on PHP 8.3 --prefer-lowest --prefer-stable	28s
	9m 35s

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