chore(deps): update dependency phpstan/phpstan to v2.1.6

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
phpstan/phpstan	2.1.5 -> 2.1.6

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Release Notes

phpstan/phpstan (phpstan/phpstan)

v2.1.6

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Improvements 🔧

• This release includes improvements from PHPStan 1.12.19
• PHP 8.4: Overriding property - when overriding readable property, the property has to be readable (same for writable) (phpstan/phpstan-src@924a7a2)
• ClassReflection - hasProperty cache (phpstan/phpstan-src@73d7b88)
• Updated phpdoc-parser
  • Allow multiple new lines in union and intersection declaration (https://github.com/phpstan/phpdoc-parser/pull/265), thanks @​DaDeather!
  • TypeParser - support comments at EOL with // (https://github.com/phpstan/phpdoc-parser/pull/264), https://github.com/phpstan/phpdoc-parser/issues/184, thanks @​shmax!

Bugfixes 🐛

• Do not report constructor unused parameter if class is an Attribute class (#​3776), #​7165, thanks @​carlos-granados!

Internals 🔍

• Test for set-hooked property being overriden by readonly property (phpstan/phpstan-src@d3909c7)

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