Update phpstan to v1.6.3

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
phpstan/phpstan	require-dev	patch	1.6.2 -> 1.6.3
phpstan/phpstan-strict-rules	require-dev	patch	1.2.0 -> 1.2.1

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Release Notes

phpstan/phpstan

v1.6.3

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Improvements 🔧

• Handle ConstantArrayType === ConstantArrayType (phpstan/phpstan-src@6e02453)
• Handle ConstantArrayType == ConstantArrayType (phpstan/phpstan-src@c9ae89c)
• Understand == between ConstantScalarType (phpstan/phpstan-src@5c85200)
• Use root expression when checking impossible types (#​1254), thanks @​herndlm!
• implemented str_contains FunctionTypeSpecifyingExtension (#​1068), thanks @​staabm!

Bleeding edge 🔪

• ConstantLooseComparisonRule - level 4 (phpstan/phpstan-src@6ebf236)

If you want to see the shape of things to come and adopt bleeding edge features early, you can include this config file in your project's phpstan.neon:

includes:
	- vendor/phpstan/phpstan/conf/bleedingEdge.neon

Of course, there are no backwards compatibility guarantees when you include this file. The behaviour and reported errors can change in minor versions with this file included. Learn more

Bugfixes 🐛

• Fix first-class callable internal error (phpstan/phpstan-src@3f75d8a), #​7135

phpstan/phpstan-strict-rules

v1.2.1

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• f3ca646 - Turn on checkAlwaysTrueLooseComparison

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