Remove unused tools

Author: loevgaard

.github/workflows/build.yaml

@@ -91,7 +91,7 @@ jobs:
                     coverage: "none"
                     extensions: "${{ env.PHP_EXTENSIONS }}"
                     php-version: "${{ matrix.php-version }}"
-                    tools: "composer-require-checker, composer-unused, flex"
+                    tools: "flex"
 
             -   name: "Install composer dependencies"
                 uses: "ramsey/composer-install@v3"