Update phpstan/phpstan requirement from 1.10.39 to 1.10.50

[dependabot[bot]]

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

Release notes

Sourced from phpstan/phpstan's releases.

1.10.50

Improvements 🔧

• Update nikic/php-parser to 4.18.0 (https://github.com/phpstan/phpstan-src/commit/24f92cc2a69cbeecefb8e2093c6db41138cc9398)

Bugfixes 🐛

• VoidType - accept null (https://github.com/phpstan/phpstan-src/commit/40c8fb2266f040158fb811ac13b21a3e179c022a), #10291

Internals 🔍

• InvalidPromotedPropertiesRule - use FunctionLike as node type (#2823), thanks @​paulbalandan!
• Deduplicate inferred template type generalization logic (https://github.com/phpstan/phpstan-src/commit/39fe102d23c8aec32b8c21225152e2d835d224b2)

Commits

• 06a9851 PHPStan 1.10.50
• 39fe102 Updated PHPStan to commit 39fe102d23c8aec32b8c21225152e2d835d224b2
• a532baf Updated PHPStan to commit a532baf63ebd292df1fcc5ccff27935917e6c285
• 24f92cc Updated PHPStan to commit 24f92cc2a69cbeecefb8e2093c6db41138cc9398
• ac7c75e Updated PHPStan to commit ac7c75e0581fbb35cae145609e2d06191677b52c
• 40c8fb2 Updated PHPStan to commit 40c8fb2266f040158fb811ac13b21a3e179c022a
• db1a52a WP CS in integration tests
• 9367ba4 PHPStan 1.10.49
• 71f6c4d Updated PHPStan to commit 71f6c4d5fc21b6e880412c67ce8f745367f24d3d
• 7c83225 Updated PHPStan to commit 7c832255ba59922db3225ee763c109d6c1e29f7a
• Additional commits viewable in compare view

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[dependabot[bot]]

Superseded by #214.