Bump phpstan/phpstan from 0.12.90 to 0.12.91

Bumps [phpstan/phpstan](https://github.com/phpstan/phpstan) from 0.12.90 to 0.12.91.
- [Release notes](https://github.com/phpstan/phpstan/releases)
- [Commits](phpstan/phpstan@0.12.90...0.12.91)

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

Signed-off-by: dependabot[bot] <support@github.com>