use debian source for direct installation of MQTT (#7423)

as newer Debian contains mosquitto in sources, directly install it without adding extra repository

Author: EtlamGit

install/mqtt-install.sh

@@ -15,12 +15,10 @@ update_os
 
 msg_info "Installing Mosquitto MQTT Broker"
 source /etc/os-release
-curl -fsSL http://repo.mosquitto.org/debian/mosquitto-repo.gpg >/usr/share/keyrings/mosquitto-repo.gpg.key
-chmod go+r /usr/share/keyrings/mosquitto-repo.gpg.key
-echo "deb [arch=$(dpkg --print-architecture) signed-by=/usr/share/keyrings/mosquitto-repo.gpg.key] http://repo.mosquitto.org/debian ${VERSION_CODENAME} main" >/etc/apt/sources.list.d/mosquitto.list
 $STD apt-get update
 $STD apt-get -y install mosquitto
 $STD apt-get -y install mosquitto-clients
+
 cat <<EOF >/etc/mosquitto/conf.d/default.conf
 allow_anonymous false
 persistence true