Bump alpine from 3.17.1 to 3.17.2 (#49)

Dockerfile

@@ -1,4 +1,4 @@
-FROM docker.io/alpine:3.17.1
+FROM docker.io/alpine:3.17.2
 
 ARG DOVECOT_PACKAGE_VERSION=2.3.20-r6
 ARG SOCAT_PACKAGE_VERSION=1.7.4.4-r0