Update dependency phpstan/phpstan to v1.12.14

This MR contains the following updates:

Package	Type	Update	Change
phpstan/phpstan	require-dev	patch	1.12.13 -> 1.12.14

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Release Notes

phpstan/phpstan (phpstan/phpstan)

v1.12.14

Compare Source

Fix preg_match() group containing start/end meta characters (#​3740), #​12297, thanks @​staabm!

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