Revert 1.x docker builds to alpine 3.14 due to openssl build errors

docker/1.5-openssl/Dockerfile

@@ -1,4 +1,4 @@
-FROM alpine:3.16
+FROM alpine:3.14
 
 LABEL maintainer="Roger Light <roger@atchoo.org>" \
     description="Eclipse Mosquitto MQTT Broker"

docker/1.5/Dockerfile

@@ -1,4 +1,4 @@
-FROM alpine:3.16
+FROM alpine:3.14
 
 LABEL maintainer="Roger Light <roger@atchoo.org>" \
     description="Eclipse Mosquitto MQTT Broker"

docker/1.6-openssl/Dockerfile

@@ -1,4 +1,4 @@
-FROM alpine:3.16
+FROM alpine:3.14
 
 LABEL maintainer="Roger Light <roger@atchoo.org>" \
     description="Eclipse Mosquitto MQTT Broker"

docker/1.6/Dockerfile

@@ -1,4 +1,4 @@
-FROM alpine:3.16
+FROM alpine:3.14
 
 LABEL maintainer="Roger Light <roger@atchoo.org>" \
     description="Eclipse Mosquitto MQTT Broker"