Bump phpstan/php-8-stubs from 0.4.28 to 0.4.31

Bumps [phpstan/php-8-stubs](https://github.com/phpstan/php-8-stubs) from 0.4.28 to 0.4.31.
- [Release notes](https://github.com/phpstan/php-8-stubs/releases)
- [Commits](phpstan/php-8-stubs@0.4.28...0.4.31)

---
updated-dependencies:
- dependency-name: phpstan/php-8-stubs
  dependency-version: 0.4.31
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]