This MR contains the following updates:

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

phpstan/phpstan

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 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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