[TLSCertsMonitor] Fix image name in Docker Compose and bump to Alpine 3.11

pica-tls-certs-monitor/Dockerfile

-FROM alpine:3.9
+FROM alpine:3.11
 
 WORKDIR /usr/src/app
 

pica-tls-certs-monitor/docker-compose.yml

 version: '3.7'
 
 services:
-  tls-cert-monitor:
-    image: tls-cert-monitor:v1.4
-    container_name: tls-cert-monitor
+  tls-certs-monitor:
+    image: registry.picasoft.net/pica-tls-certs-monitor:v1.4
+    container_name: tls-certs-monitor
     volumes:
       - /DATA/docker/traefik/certs/acme.json:/certs/acme.json
       - /DATA/docker/tls/certs:/output