chore(deps-dev): bump squizlabs/php_codesniffer from 3.7.1 to 3.8.1

Bumps [squizlabs/php_codesniffer](https://github.com/squizlabs/PHP_CodeSniffer) from 3.7.1 to 3.8.1.
- [Release notes](https://github.com/squizlabs/PHP_CodeSniffer/releases)
- [Commits](https://github.com/squizlabs/PHP_CodeSniffer/commits)

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

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