Update dependency phpstan/phpstan to v0.11.12

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
phpstan/phpstan	require-dev	patch	0.11.9 -> 0.11.12

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Release Notes

phpstan/phpstan

v0.11.12

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Fix inherited @return $this / @return static (56b3eb2), #​1648, #​2278

v0.11.11

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Fixed when the tip of the day about inferrable private property type is showed (5c7d447), #​2276

v0.11.10

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Improvements

• Infer private property type from constructor (opt-in) (6771e62) - turn on with inferPrivatePropertyTypeFromConstructor: true
• Handle @inheritdoc without curly braces (#​2054), thanks @​daniel-iwaniec!
• Introducing 💡 Tips of the Day (0e3914e). Can be turned off with tipsOfTheDay: false.

Bugfixes

• Fix the incosistency between Type::isSubtypeOf() and accepts() by introducing isAcceptedBy() (08e0288), #​2230, #​2267

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