Bump phpstan/phpstan from 2.1.46 to 2.1.50 in the phpstan-packages group (#1061)

---
updated-dependencies:
- dependency-name: phpstan/phpstan
  dependency-version: 2.1.50
  dependency-type: direct:development
  update-type: version-update:semver-patch
  dependency-group: phpstan-packages
...

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