Update dependency tianon/gosu to v1.20

Signed-off-by: milkmaker <milkmaker@mailcow.de>

data/Dockerfiles/dovecot/Dockerfile

@@ -3,7 +3,7 @@ FROM alpine:3.21
 LABEL maintainer="The Infrastructure Company GmbH <info@servercow.de>"
 
 # renovate: datasource=github-releases depName=tianon/gosu versioning=semver-coerced extractVersion=^(?<version>.*)$
-ARG GOSU_VERSION=1.19
+ARG GOSU_VERSION=1.20
 
 ENV LANG=C.UTF-8
 ENV LC_ALL=C.UTF-8

data/Dockerfiles/sogo/Dockerfile

@@ -17,7 +17,7 @@ ARG SOPE_VERSION=SOPE-5.12.12
 # Security patches to apply (space-separated commit hashes)
 ARG SOGO_SECURITY_PATCHES=""
 # renovate: datasource=github-releases depName=tianon/gosu versioning=semver-coerced extractVersion=^(?<version>.*)$
-ARG GOSU_VERSION=1.19
+ARG GOSU_VERSION=1.20
 ENV LC_ALL=C
 
 # Install dependencies, build SOPE and SOGo, then clean up (all in one layer to minimize image size)