Update phpstan/phpstan requirement from 1.8.0 to 1.9.9

[dependabot[bot]]

Updates the requirements on phpstan/phpstan to permit the latest version.

Release notes

Sourced from phpstan/phpstan's releases.

1.9.9

Improvements 🔧

• New method Type::getEnumCases() to use instead of instanceof EnumCaseObjectType (https://github.com/phpstan/phpstan-src/commit/a0242e0f7234b4e78a59ddc6ea79342cd1e03c0f)

Bugfixes 🐛

• Last elseif can be exhaustive and no else branch is needed (https://github.com/phpstan/phpstan-src/commit/94e6e466f44a0dbbcb6182b32628d97a80109305), #7547
• Fix resolving of __CLASS__, __NAMESPACE__ in traits (#2043), #3019, thanks @​staabm!
• class_implements dynamic return type extension (#2023), #4335, thanks @​VincentLanglet!

Function signature fixes 🤖

• ReflectionClass::newInstanceArgs() type fix for named arguments (#2176), #8679, thanks @​s3b4stian!

Internals 🔍

• Exit early in TrinaryLogic::lazyAnd() and lazyOr() if current instance allows it (#2173), thanks @​herndlm!
• Remove unused iterable check in MissingTypehintCheck (#2174), thanks @​herndlm!

Commits

• f68d7cc PHPStan 1.9.9
• a2a733b Updated PHPStan to commit a2a733b6a4544560bf7f2e9189ea8d34d6fdcb2d
• af1cfcf Update Larastan baseline
• 40aec1e Updated PHPStan to commit 40aec1e1d249132490a0386301cdf34ed252182d
• 865a4ba Updated PHPStan to commit 865a4ba417712d3b13247f655dddf492feac6254
• a1e5eb4 Updated PHPStan to commit a1e5eb49e3b9c963d3b51fb92c130330bef294e3
• acee0af Updated PHPStan to commit acee0afcfff705a664a477b4632e3b9e2e83f5f4
• 94e6e46 Updated PHPStan to commit 94e6e466f44a0dbbcb6182b32628d97a80109305
• 560a0cc Updated PHPStan to commit 560a0cc1ad7d0e92040a85d38725628ce2b0f361
• a0242e0 Updated PHPStan to commit a0242e0f7234b4e78a59ddc6ea79342cd1e03c0f
• Additional commits viewable in compare view

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[dependabot[bot]]

Superseded by #223.