Add new Mosquitto version 2.1.2 to tests

This branch is a test to see if MosquittoContainer fails with existing tests when using version 2.1.2

Author: f18m

modules/mqtt/tests/test_mosquitto.py

@@ -2,7 +2,7 @@
 
 from testcontainers.mqtt import MosquittoContainer
 
-VERSIONS = ["1.6.15", "2.0.18"]
+VERSIONS = ["1.6.15", "2.0.18", "2.1.2"]
 
 
 @pytest.mark.parametrize("version", VERSIONS)