Update dependency phpstan/phpstan to v1.4.6

This MR contains the following updates:

Package	Type	Update	Change
phpstan/phpstan	require-dev	patch	1.4.5 -> 1.4.6

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Release Notes

phpstan/phpstan

v1.4.6

Compare Source

Improvements

• Implemented constant type inference for implode() function (#​991), thanks @​staabm!

Bugfixes

• Fix interaction between template type and union type (#​992), #​5591, thanks @​arnaud-lb!
• Delegate most of TypeCombinator::remove() to Type::tryRemove() (#​994), #​6438, thanks @​arnaud-lb!
• TemplateType should accept a TemplateType derived from itself (#​999), #​5844, #​5706, thanks @​arnaud-lb!
• Fixed intersecting and removal from TemplateUnionType (https://github.com/phpstan/phpstan-src/commit/0d288353ca782ef79e362657c2581abf4246a2f8), #​6566
• Fixed type seen by IterableInForeachRule with inline @var right above foreach (https://github.com/phpstan/phpstan-src/commit/b6bbbaf6b01cbd43ae2800bbd00fe0ddbcb2e0d9), #​6564
• modulo 1 is always zero (#​973), thanks @​staabm!
• multiply by zero is always zero (#​974), thanks @​staabm!
• Fixed discovering backed enum without space around : (https://github.com/phpstan/phpstan-src/commit/5162bcfea5456eb827035cd249c5ace55057237b), https://github.com/composer/composer/issues/10498

Function signature fixes

• Function md5() always return non-empty-string (#​987), thanks @​janbarasek!
• Correct the case for parameters that accept an instance of Iterator. (#​988), thanks @​johnbillion!
• Fix the return types of round()/ceil()/floor() (#​729), thanks @​johnbillion!
• Correct the return type of SplFileObject::fstat() (#​996), thanks @​johnbillion!
• Improve the return type of functions that return an indexed array of strings (#​997), thanks @​johnbillion!

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