[Dovecot] Important fix for Pigeonhole (downgrade)

data/Dockerfiles/dovecot/Dockerfile

@@ -4,7 +4,7 @@ LABEL maintainer "Andre Peters <andre.peters@servercow.de>"
 ARG DEBIAN_FRONTEND=noninteractive
 ENV LC_ALL C
 ENV DOVECOT_VERSION 2.2.31
-ENV PIGEONHOLE_VERSION 0.4.19
+ENV PIGEONHOLE_VERSION 0.4.18
 
 RUN apt-get update && apt-get -y install \
 	automake \

docker-compose.yml

@@ -172,7 +172,7 @@ services:
             - sogo
 
     dovecot-mailcow:
-      image: mailcow/dovecot:1.2
+      image: mailcow/dovecot:1.3
       build: ./data/Dockerfiles/dovecot
       depends_on:
         unbound-mailcow: