chore: `1.8.6` changelog #2691

Job	Run time
run / PHPStan PHP 7.3	1m 0s
run / PHPStan PHP 7.4	52s
run / PHPStan PHP 8.0	54s
run / PHPStan PHP 8.1	55s
run / PHPStan PHP 8.2	56s
run / PHPStan PHP 8.3	1m 0s
run / PHP ${{ matrix.php }} / ${{ matrix.db }} ${{ matrix.prefixStr }}	0s
	5m 37s

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