Move the default MQTT protocol to be TLS v1.2

ssl.PROTOCOL_TLS has been deprecated in python and 1.2 is the latest
version to date.

Signed-off-by: Pierre-Yves Chibon <pingou@pingoured.fr>

doc/configuration.rst

@@ -1825,7 +1825,7 @@ MQTT_TLS_VERSION
 When using SSL-based authentication to the MQTT server, use this
 configuration key to specify the TLS protocols to support/use.
 
-Defaults to: ``ssl.PROTOCOL_TLS`` (from python's ssl library)
+Defaults to: ``ssl.PROTOCOL_TLSv1_2`` (from python's ssl library)
 
 
 MQTT_CIPHERS

pagure/lib/notify.py

@@ -122,7 +122,9 @@ def mqtt_publish(topic, message):
     mqtt_certfile = pagure_config.get("MQTT_CERTFILE")
     mqtt_keyfile = pagure_config.get("MQTT_KEYFILE")
     mqtt_cert_reqs = pagure_config.get("MQTT_CERT_REQS", ssl.CERT_REQUIRED)
-    mqtt_tls_version = pagure_config.get("MQTT_TLS_VERSION", ssl.PROTOCOL_TLS)
+    mqtt_tls_version = pagure_config.get(
+        "MQTT_TLS_VERSION", ssl.PROTOCOL_TLSv1_2
+    )
     mqtt_ciphers = pagure_config.get("MQTT_CIPHERS")
 
     # We catch Exception if we want :-p