Bump mglaman/phpstan-drupal from 1.1.37 to 1.2.0 (#448)

Bumps [mglaman/phpstan-drupal](https://github.com/mglaman/phpstan-drupal) from 1.1.37 to 1.2.0.
- [Release notes](https://github.com/mglaman/phpstan-drupal/releases)
- [Commits](mglaman/phpstan-drupal@1.1.37...1.2.0)

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

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