Bump phpstan/phpstan-doctrine from 1.3.6 to 1.3.7

Bumps [phpstan/phpstan-doctrine](https://github.com/phpstan/phpstan-doctrine) from 1.3.6 to 1.3.7.
- [Release notes](https://github.com/phpstan/phpstan-doctrine/releases)
- [Commits](phpstan/phpstan-doctrine@1.3.6...1.3.7)

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

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