Update phpstan/phpstan requirement from ^1.10 to ^2.0

[dependabot[bot]]

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

Release notes

Sourced from phpstan/phpstan's releases.

2.0.1

Bugfixes 🐛

• fix: check for existence of second arg in CountCharsFunctionDynamicReturnTypeExtension (#3620), thanks @​canvural!
• Fix resolving tentative return type (https://github.com/phpstan/phpstan-src/commit/753fc4d98fe8929aa8816f454d2f9a836ccd7a6b)
• And fixes from PHPStan 1.12.10

Commits

• ab4e9b4 PHPStan 2.0.1
• 2b4818b Only run Homebrew release on 2.*
• 2f70d9f Updated PHPStan to commit 2f70d9fadcc3d5b38aae37091928c7ff7f63320c
• 2da94f8 Updated PHPStan to commit 2da94f843fd52b2c5a0bd835d2dcd0205f261616
• acce3d7 Update BACKERS.md
• 3bccb6d Coreecet typo in UPGRADING.md
• edcc9e8 Updated PHPStan to commit edcc9e8a875990913769cc355d2a775543da16a2
• 74557f2 Update index.njk
• 6517446 Updated PHPStan to commit 6517446a99d70c75015e6fc2990adba63a662913
• 4ca17a7 Playground runner - update deps
• Additional commits viewable in compare view

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