Update dependency phpstan/phpstan to v1.6.7

This MR contains the following updates:

Package	Type	Update	Change
phpstan/phpstan	require-dev	patch	1.6.3 -> 1.6.7

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Release Notes

phpstan/phpstan

v1.6.7

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• Make DateTime(Immutable)::modify() behaviour less annoying (https://github.com/phpstan/phpstan-src/commit/7bd9fb7285ee8cab34dac2d29f84485ad3c40643)

v1.6.6

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Improvements 🔧

• OptimizedPsrAutoloaderLocator - look for other symbols in already scanned files (https://github.com/phpstan/phpstan-src/commit/e40474b3fcd27e5a2b37b8f6add8e7ad906db019), #​7157, #​7112
• Bleeding Edge: Move IllegalConstructorMethodCallRule and IllegalConstructorStaticCallRule to phpstan-strict-rules (https://github.com/phpstan/phpstan-src/commit/124b30f98c182193187be0b9c2e151e477429b7a, https://github.com/phpstan/phpstan-strict-rules/commit/0c82c96f2a55d8b91bbc7ee6512c94f68a206b43)
• Add DateTimeModifyReturnTypeExtension (#​1267), #​4927, thanks @​VincentLanglet!

Bugfixes 🐛

• Fix return type of DateTime(Immutable)::modify() (https://github.com/phpstan/phpstan-src/commit/b5da7cea2acb069249f474053e430559ef913280), #​6609

v1.6.5

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Improvements 🔧

• Implement conditional parameter types (#​1264), #​7124, thanks @​rvanvelzen!
• Narrow type of json_decode (#​993), thanks @​TomasVotruba and @​herndlm!

Bugfixes 🐛

• Fix Rector autoloading issue (https://github.com/phpstan/phpstan-src/commit/46f51e71c32b79313e36e6fd26fba94e6e8c70db), #​7150
• Make $conditionalExpressions key consistent in all usages (#​1270), thanks @​rajyan!
• Do not call TypeSpecifier::specifyTypesInCondition with a non-null context in case the original context is null (#​1275), #​7166, thanks @​herndlm!
• Add throw point for division by zero (#​1280), #​6349, thanks @​rajyan!

v1.6.4

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Improvements 🔧

• Generating baseline preserves the number of newlines at the end of the file (#​1243), thanks @​VasekPurchart!
• Infer non-empty-string on literal-string and strlen() (#​1260), thanks @​staabm!

Bugfixes 🐛

• AutoloadSourceLocator - fix opcache corruption (https://github.com/phpstan/phpstan-src/commit/ae53760a875a118131df949a7547fb9f1a55e904), #​7151
• FileReadTrapStreamWrapper - be aware of multiple files (https://github.com/phpstan/phpstan-src/commit/28eaba24ac21097fb8f2b5f738db9c090e4d6443), #​7151

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