Fixed phpstan errors

module/Rest/src/Action/AuthenticateAction.php

@@ -42,7 +42,7 @@ class AuthenticateAction extends AbstractRestAction
 
     /**
      * @param Request $request
-     * @return null|Response
+     * @return Response
      * @throws \InvalidArgumentException
      */
     public function handle(Request $request): Response

module/Rest/src/Action/CreateShortcodeAction.php

@@ -43,7 +43,7 @@ class CreateShortcodeAction extends AbstractRestAction
 
     /**
      * @param Request $request
-     * @return null|Response
+     * @return Response
      * @throws \InvalidArgumentException
      */
     public function handle(Request $request): Response

module/Rest/src/Action/EditShortcodeTagsAction.php

@@ -35,7 +35,7 @@ class EditShortcodeTagsAction extends AbstractRestAction
 
     /**
      * @param Request $request
-     * @return null|Response
+     * @return Response
      * @throws \InvalidArgumentException
      */
     public function handle(Request $request): Response

module/Rest/src/Action/GetVisitsAction.php

@@ -36,7 +36,7 @@ class GetVisitsAction extends AbstractRestAction
 
     /**
      * @param Request $request
-     * @return null|Response
+     * @return Response
      * @throws \InvalidArgumentException
      */
     public function handle(Request $request): Response

module/Rest/src/Action/ListShortcodesAction.php

@@ -37,7 +37,7 @@ class ListShortcodesAction extends AbstractRestAction
 
     /**
      * @param Request $request
-     * @return null|Response
+     * @return Response
      * @throws \InvalidArgumentException
      */
     public function handle(Request $request): Response

module/Rest/src/Action/ResolveUrlAction.php

@@ -36,7 +36,7 @@ class ResolveUrlAction extends AbstractRestAction
 
     /**
      * @param Request $request
-     * @return null|Response
+     * @return Response
      * @throws \InvalidArgumentException
      */
     public function handle(Request $request): Response