Bump phpstan/phpstan from 1.8.0 to 1.9.14 (#108)

Bumps [phpstan/phpstan](https://github.com/phpstan/phpstan) from 1.8.0 to 1.9.14.
- [Release notes](https://github.com/phpstan/phpstan/releases)
- [Changelog](https://github.com/phpstan/phpstan/blob/1.10.x/CHANGELOG.md)
- [Commits](phpstan/phpstan@1.8.0...1.9.14)

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

Signed-off-by: dependabot[bot] <[email protected]>

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>