Bump mglaman/phpstan-drupal from 1.2.12 to 1.3.1

Bumps [mglaman/phpstan-drupal](https://github.com/mglaman/phpstan-drupal) from 1.2.12 to 1.3.1.
- [Release notes](https://github.com/mglaman/phpstan-drupal/releases)
- [Commits](mglaman/phpstan-drupal@1.2.12...1.3.1)

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

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