Upgrade Snap Candidate to MongoDB 6.0.6.

Thanks to MongoDB developers !

snapcraft.yaml

@@ -65,8 +65,7 @@ apps:
 
 parts:
     mongodb:
-        #source: https://fastdl.mongodb.org/linux/mongodb-linux-x86_64-ubuntu2004-5.0.15.tgz
-        source: https://fastdl.mongodb.org/linux/mongodb-linux-x86_64-ubuntu2004-6.0.5.tgz
+        source: https://fastdl.mongodb.org/linux/mongodb-linux-x86_64-ubuntu2004-6.0.6.tgz
         plugin: dump
         stage-packages:
             - libssl1.1