chore(deps): update kong docker tag to v2.4.0

Author: renovate-bot

docker-compose.yml

@@ -42,7 +42,7 @@ services:
       retries: 5
 
   kong-migration:
-    image: kong:2.3.3@sha256:d4c036d82d35e0c56a5a7dc1d018a92e97b7a9540cb202dd39753e70bac72de9
+    image: kong:2.4.0@sha256:91e8a6689f3c5c522dabbae93d5cc5006da9931ab3e325de2c944ba87622e906
     depends_on:
       - postgres-kong
     environment:
@@ -53,7 +53,7 @@ services:
     restart: on-failure
 
   kong:
-    image: kong:2.3.3@sha256:d4c036d82d35e0c56a5a7dc1d018a92e97b7a9540cb202dd39753e70bac72de9
+    image: kong:2.4.0@sha256:91e8a6689f3c5c522dabbae93d5cc5006da9931ab3e325de2c944ba87622e906
     depends_on:
       - postgres-kong
       - kong-migration