Update phpstan/phpstan requirement from 1.12.21 to 2.1.8

[dependabot]

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

Release notes

Sourced from phpstan/phpstan's releases.

2.1.8

Improvements 🔧

• @readonly property cannot be passed by-ref (#3850), #12676, thanks @​staabm!
• ClassReflection - cannot be a subclass of final-overriden class (phpstan/phpstan-src@ed4ea0a)
• Deprecated ClassReflection::isSubclassOf(string $className) in favour of ClassReflection::isSubclassOfClass(ClassReflection $class)
  • If you just have string $className instead of ClassReflection and you are too lazy to get ClassReflection via ReflectionProvider, you can still use ClassReflection::is(string $className)

Bugfixes 🐛

• This release includes fixes from PHPStan 1.12.21
• Cannot override being final for abstract classes (phpstan/phpstan-src@9bb2ed5)
• Fix unsetting array item triggering unset.possiblyHookedProperty (#3855), #12695, thanks @​staabm!
• UnusedPrivatePropertyRule - handle virtual properties that can only be read or only written (phpstan/phpstan-src@da73771, phpstan/phpstan-src@12185ab), #12702
• Faster analysis with a big const array in a class (#3862), #12159, thanks @​staabm!

Internals 🔍

• Fix typo false-positive (#3856), thanks @​staabm!
• Reduce method calls in ExpressionTypeHolder (#3859), thanks @​staabm!
• Faster TrinaryLogic::and() (#3860), thanks @​staabm!
• Faster MutatingScope::mergeWith() (#3861), thanks @​staabm!
• Added regression test (#3863), thanks @​staabm!

Commits

• f9adff3 PHPStan 2.1.8
• 43403e4 Update errors identifiers
• 781aefa Updated PHPStan to commit 781aefaf6b2bbaca5a02e017984852fc1b9b99f0
• e05aaed Updated PHPStan to commit e05aaed53e1cdaaacd4f052195ae7f9996ee058d
• b1a96eb Update errors identifiers
• 75ac060 Updated PHPStan to commit 75ac0608c6b7283d83ea16e5c503d3328c34fb4a
• f29c855 Updated PHPStan to commit f29c855ec94015bfd77caa97b9cee6e9d38ca5a0
• 692d510 Updated PHPStan to commit 692d5103e089f902ab930022ebbc6ee31c850002
• dde8da5 Updated PHPStan to commit dde8da5c697f0d5e8fe4f8e356342afe513fa9fa
• 0048b35 Update errors identifiers
• Additional commits viewable in compare view

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[greg0ire]

🤔 I should configure dependabot to target 1.8.x

[greg0ire]

@dependabot recreate

[dependabot]

Looks like phpstan/phpstan is up-to-date now, so this is no longer needed.