Update phpstan/phpstan requirement from 1.8.0 to 1.8.1

[dependabot[bot]]

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

Release notes

Sourced from phpstan/phpstan's releases.

1.8.1

Improvements 🔧

• ReadWritePropertiesExtensions are part of ClassPropertiesNode (https://github.com/phpstan/phpstan-src/commit/49c27d8849b1d153a67f28e612e490a71b4fd477), phpstan/phpstan-src#1480
• Add ClosureTypeFactory (#1484), https://github.com/phpstan/phpstan/discussions/7546, thanks @​canvural!
• Handle native function @throws tag in stub file (#1487), #7552, thanks @​VincentLanglet!
• Add #[AllowDynamicProperties] PHP 8.2 attribute stub (#1478), thanks @​andypost!
• Add rule that disallows final private methods on PHP 8.0+ (#1490), thanks @​herndlm!
• Inherit @immutable phpdoc (#1489), #7506, thanks @​herndlm!
• Mark ClassReflection::evictPrivateSymbols() as internal (https://github.com/phpstan/phpstan-src/commit/9138ab2a1b63d9ee31764cc812cca404f265ecb7)

Bugfixes 🐛

• Fix type specification of various string functions with constant strings in a falsey context (#1488), #7555, thanks @​herndlm!
• Fix ConstantArrayType creation for preg_split with PREG_SPLIT_OFFSET_CAPTURE (#1486), #7554, thanks @​herndlm!
• Reindex constant arrays via shuffle (#1438), #6138, thanks @​herndlm!
• Fix union and intersection between StaticType and ThisType (https://github.com/phpstan/phpstan-src/commit/e20e9345f57a7cd760967f459aa1eedfe2eabff8), #6291, #7211, #7550
• Enhance FILTER_VALIDATE_INT option in filter_var (#1499), #7608, thanks @​takeokunn!
• Fix handling of str_split / mb_str_split string arg compound types (#1496), #7580, thanks @​herndlm!
• Fix Identical type specification of constant types (#1493), #7257, #6781, #6647, #5896, #5474, #6000, thanks @​herndlm!
• Better StaticType::traverse() (https://github.com/phpstan/phpstan-src/commit/0e257067ff92fbcb37b034cccdbea864a233c198)
• GenericClassStringType::isSuperTypeOf() - do not convert maybe into no (https://github.com/phpstan/phpstan-src/commit/6fba5429b9784801a89cdc6cfa3d6f8cfd1d82e8), #6697
• Fix subtractable StaticType (https://github.com/phpstan/phpstan-src/commit/0906336d29e807baba1a9eeca7b1545240c4ce5c), #6443

Function signature fixes 🤖

• Fix return type of octdec() (#1500), thanks @​zonuexe!

Commits

• 8dbba63 PHPStan 1.8.1
• 4333bf2 Updated PHPStan to commit 4b01b38012a6aede6ca1174cbc1ada7d9e87a7bc
• 5a240d2 Update config-reference.json
• 1ec1476 Updated PHPStan to commit a838bb4693e4287dd1aadf8aa4752ce1dda560a2
• 617d6e9 Updated PHPStan to commit 0906336d29e807baba1a9eeca7b1545240c4ce5c
• 613472c Update README.md
• 4a01976 Updated PHPStan to commit 0e257067ff92fbcb37b034cccdbea864a233c198
• 6591cbc Fix broken links
• 598a817 Try fix from a pull request
• c7d17a4 Trigger Check Website Links workflow after yml change
• Additional commits viewable in compare view

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Superseded by #192.