upgrade alpine base image from v3.18.5 to v3.19.0 including upgrade o…

…f dovecot package from v2.3.20-r11 to v2.3.21-r17 & socat package from v1.7.4.4-r1 to v1.8.0.0-r0

https://web.archive.org/web/20231210083657/https://dovecot.org/doc/NEWS
https://git.alpinelinux.org/aports/commit/main/dovecot?h=3.19-stable&id=2a1b25fbea63904fd62f74d3a9563b4597845d09
https://git.alpinelinux.org/aports/commit/main/dovecot?h=3.19-stable&id=52701570e6d3b52be6a09b252f8c5bb7782fab6b
https://git.alpinelinux.org/aports/commit/main/dovecot?h=3.19-stable&id=5c57bb20fc86cec96125d92c989ed0894c77ac07
https://git.alpinelinux.org/aports/commit/main/dovecot?h=3.19-stable&id=a558b555cbe0efb269a0237ed4a6bb063a4c2116
https://git.alpinelinux.org/aports/commit/main/dovecot?h=3.19-stable&id=815bb154f5337786fa025d420a0399696dfc0149
https://git.alpinelinux.org/aports/commit/main/dovecot?h=3.19-stable&id=b5e441817f54422dca3f77e84a2f834794fd7412
https://git.alpinelinux.org/aports/commit/main/dovecot?h=3.19-stable&id=adcd82d0177f57a1be553f4f0bd2326103234091
https://git.alpinelinux.org/aports/commit/main/dovecot?h=3.19-stable&id=4de114f68949899068f424d6677ea6d58919fc2f

https://web.archive.org/web/20231210082945/http://www.dest-unreach.org/socat/
https://git.alpinelinux.org/aports/commit/main/socat?h=3.19-stable&id=5eb289a3a4a47430a7c8e2a6e7686fdb26e54ec6

Dockerfile

@@ -1,8 +1,11 @@
-FROM docker.io/alpine:3.18.5
+FROM docker.io/alpine:3.19.0
 
-# https://git.alpinelinux.org/aports/log/main/dovecot?h=3.18-stable
-ARG DOVECOT_PACKAGE_VERSION=2.3.20-r11
-ARG SOCAT_PACKAGE_VERSION=1.7.4.4-r1
+# https://dovecot.org/doc/NEWS
+# https://git.alpinelinux.org/aports/log/main/dovecot?h=3.19-stable
+ARG DOVECOT_PACKAGE_VERSION=2.3.21-r17
+# http://www.dest-unreach.org/socat/
+# https://git.alpinelinux.org/aports/log/main/socat?h=3.19-stable
+ARG SOCAT_PACKAGE_VERSION=1.8.0.0-r0
 RUN apk add --no-cache \
         dovecot-lmtpd=$DOVECOT_PACKAGE_VERSION \
         dovecot-pigeonhole-plugin=$DOVECOT_PACKAGE_VERSION \