Bump ruff from 0.6.3 to 0.6.4 in /02_mqtt-cluster (#1157)

Author: dependabot[bot]

02_mqtt-cluster/poetry.lock

@@ -36,7 +36,7 @@ pytest-xdist = { version="^3.6.1",extras =["psutil2"]}
 pytest-timeout = "^2.3.1" 
 pytest-cov = "^5.0.0"
 safety = "^3.2.7"
-ruff = "^0.6.3"
+ruff = "^0.6.4"
 
 
 [build-system]