Update wearerequired/coding-standards requirement from ^5.0 to ^6.0 (#7)

* Update wearerequired/coding-standards requirement from ^5.0 to ^6.0

Updates the requirements on [wearerequired/coding-standards](https://github.com/wearerequired/coding-standards) to permit the latest version.
- [Release notes](https://github.com/wearerequired/coding-standards/releases)
- [Changelog](https://github.com/wearerequired/coding-standards/blob/master/CHANGELOG.md)
- [Commits](wearerequired/coding-standards@5.0.0...6.0.0)

---
updated-dependencies:
- dependency-name: wearerequired/coding-standards
  dependency-type: direct:development
...

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

* Add more type hints, bump PHP requirement

* Update PHP version used for linting

---------

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

.github/workflows/coding-standards.yml

@@ -30,7 +30,7 @@ jobs:
       - name: Set up PHP
         uses: shivammathur/setup-php@v2
         with:
-          php-version: "7.4"
+          php-version: "8.0"
           coverage: none
           tools: composer
 

composer.json

@@ -23,7 +23,7 @@
   },
   "require-dev": {
     "dealerdirect/phpcodesniffer-composer-installer": "^0.7 || ^1.0",
-    "wearerequired/coding-standards": "^5.0"
+    "wearerequired/coding-standards": "^6.0"
   },
   "minimum-stability": "dev",
   "prefer-stable": true,