ci: Bump dev dependencies (#21)

Bumps the dev-dependencies group with 2 updates: [phpstan/phpstan](https://github.com/phpstan/phpstan) and [squizlabs/php_codesniffer](https://github.com/squizlabs/PHP_CodeSniffer).


Updates `phpstan/phpstan` from 1.10.36 to 1.10.67
- [Release notes](https://github.com/phpstan/phpstan/releases)
- [Changelog](https://github.com/phpstan/phpstan/blob/1.11.x/CHANGELOG.md)
- [Commits](phpstan/phpstan@1.10.36...1.10.67)

Updates `squizlabs/php_codesniffer` from 3.7.2 to 3.9.2
- [Release notes](https://github.com/squizlabs/PHP_CodeSniffer/releases)
- [Commits](https://github.com/squizlabs/PHP_CodeSniffer/commits)

---
updated-dependencies:
- dependency-name: phpstan/phpstan
  dependency-type: direct:development
  update-type: version-update:semver-patch
  dependency-group: dev-dependencies
- dependency-name: squizlabs/php_codesniffer
  dependency-type: direct:development
  update-type: version-update:semver-minor
  dependency-group: dev-dependencies
...

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