Update phpstan/phpstan requirement from 1.12.8 to 1.12.9

[dependabot[bot]]

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

Release notes

Sourced from phpstan/phpstan's releases.

1.12.9

Improvements 🔧

• Support @readonly PHPDoc on the class as alternative to @immutable (#3523), #11775, thanks @​herndlm!

Bugfixes 🐛

• Fix too early lowercase-string inference (#3585), #11852, thanks @​VincentLanglet!
• Support for endless loops (#3573), #6807, #8463, #9374, thanks @​herndlm!
• More precise types for preg_match greater than 0 (#3612), #11293, thanks @​staabm!
• Too-wide return type - do not report void in PHPDoc union type (https://github.com/phpstan/phpstan-src/commit/5f0b1ccfa47060c209ead7116005214183c0e56f), #11980
• Too-wide return type - allow void return type in a union when the returned expr is originally void (https://github.com/phpstan/phpstan-src/commit/80c1df2d73210227776db5443dbc28c2d71fa289), #11980
• RichParser - fix @phpstan-ignore with trait in the same file (https://github.com/phpstan/phpstan-src/commit/381c1370e7ce3b1c2d8de6c5b30913908c362eb8), #11981

Internals 🔍

• Result DTOs - make reasons unique (https://github.com/phpstan/phpstan-src/commit/ccfb4ab7a19151925b9434e3245892006b3d9dcd)

Commits

• ceb937f PHPStan 1.12.9
• 80c1df2 Updated PHPStan to commit 80c1df2d73210227776db5443dbc28c2d71fa289
• f2dfd5d Updated PHPStan to commit f2dfd5debf73336a7d5c7071b42d43db975470b9
• c55aa05 Updated PHPStan to commit c55aa0586bf08b8e029576ba4a78782418b4a932
• ccfb4ab Updated PHPStan to commit ccfb4ab7a19151925b9434e3245892006b3d9dcd
• 5f0b1cc Updated PHPStan to commit 5f0b1ccfa47060c209ead7116005214183c0e56f
• b1b7782 Updated PHPStan to commit b1b778280207c076b4e92ad0b5fea385102ea9b1
• cdbc417 Do not use latest Docker tag
• 3dd5a01 Updated PHPStan to commit 3dd5a01b2f6ca0c82a5f79f5aa9ba01aa4b4c69f
• See full diff in compare view

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