feat: ready for symfony 5.3, add github actions, merged from orginal repo suncat2000#143, suncat2000#144, suncat2000#135, suncat2000#133

Author: Chris53897

src/MobileDetectBundle.php

@@ -20,11 +20,5 @@
  */
 class MobileDetectBundle extends Bundle
 {
-    /**
-     * {@inheritdoc}
-     */
-    public function getContainerExtension(): MobileDetectBundleExtension
-    {
-        return new MobileDetectBundleExtension();
-    }
+
 }