Upgrade to Gradle 7.6

* Fix `pr-build-workflow.yml` removing unused services: now they are pulled by Testcontainers
* Use official `rabbitmq:management` image instead of `MQTT`-based.
The `MQTT` is now tested with Testcontainers and Mosquitto broker image

.github/workflows/pr-build-workflow.yml

@@ -12,21 +12,11 @@ jobs:
     services:
 
       rabbitmq:
-        image: cyrilix/rabbitmq-mqtt
+        image: rabbitmq:management
         ports:
           - 5672:5672
           - 15672:15672
 
-      mongodb:
-        image: mongo
-        ports:
-          - 27017:27017
-
-      redis:
-        image: redis
-        ports:
-          - 6379:6379
-
     steps:
 
       - uses: actions/checkout@v3