chore(deps): update dependency phpstan/phpstan to v1.4.9

This MR contains the following updates:

Package	Type	Update	Change
phpstan/phpstan	require-dev	patch	1.4.8 -> 1.4.9

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Release Notes

phpstan/phpstan

v1.4.9

Compare Source

Improvements

• Identical (=== and !==) and Equal (== and !=) with the same variables resolve to ConstantBooleanType (https://github.com/phpstan/phpstan-src/commit/98c4d84ec983fb36992119d4c393d7192a2a99b6)
• Scalars of the same type on both of Equal (== and !=) are delegated to Identical (=== and !==) (https://github.com/phpstan/phpstan-src/commit/316f269d6e81fcfa435f74cb1155076e349f053f)

Bugfixes

• Fix trait detection recursion (#​1050), #​6740, thanks @​herndlm!
• Do not add null to a template type for a default parameter value null (https://github.com/phpstan/phpstan-src/commit/7a66cb6eda85703811c7dce472355e036d70c144), #​6584
• Fix nullable closure parameter type (https://github.com/phpstan/phpstan-src/commit/c05ba984a08d1fa50e0edf63e99a9a893e78e821), #​6701
• TemplateType - fix description for subtracted mixed bound (https://github.com/phpstan/phpstan-src/commit/6525d6805b1beece69ec97802bdf16dd8545cfdf)
• Fix dead catch when iterating objects (#​1051), #​5903, thanks @​rajyan!
• Fix false positive dead catch on property assignment (#​1047), #​6256, thanks @​rajyan!
• Fix template type subtraction and union (https://github.com/phpstan/phpstan-src/commit/51e2df38ee7fbda5416e1c5c1091dacf8618f3e1), #​6591
• Simulate offsetSet to get throw points for ArrayAccess assignment (#​1054), #​4852, thanks @​rajyan!
• Make return type extension for array_column() aware of PHP version (#​1053), thanks @​jlherren!
• Fix Unused private constant with an indirect access (#​1059), #​6758, thanks @​rajyan!
• Fix Equal (== and !=) handling in TypeSpecifier (https://github.com/phpstan/phpstan-src/commit/10b295f3cde7d91cc2b2784fc012910be6a06fb8)
• Fix more TypeSpecifier issues regarding Identical (=== and !==) (#​1058)

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