Update ghcr.io/graphql-hive/gateway Docker tag to v1.13.4 (#9)

* Update ghcr.io/graphql-hive/gateway Docker tag to v1.13.4

* Delete .whitesource

---------

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
Co-authored-by: Arda TANRIKULU <[email protected]>

Author: renovate[bot]

.whitesource

@@ -1,7 +1,7 @@
 name: "hive-platform-demo"
 services:
   gateway:
-    image: ghcr.io/graphql-hive/gateway:1.7.4
+    image: ghcr.io/graphql-hive/gateway:1.13.4
     depends_on:
       - users_subgraph
       - comments_subgraph