[BUGFIX] Use correct command to install dependencies in CI

Author: eliashaeussler

.github/workflows/cgl.yaml

@@ -28,7 +28,7 @@ jobs:
 
       # Install dependencies
       - name: Install Composer dependencies
-        run: composer require --no-progress --no-plugins
+        run: composer update --no-progress --no-plugins
 
       # Check Composer dependencies
       - name: Check dependencies