Bumps alpine from 3.13.4 to 3.13.5. Signed-off-by: dependabot[bot] <support@github.com>
@@ -1,4 +1,4 @@
-FROM alpine:3.13.4
+FROM alpine:3.13.5
ARG DOVECOT_PACKAGE_VERSION=2.3.13-r0
ARG SOCAT_PACKAGE_VERSION=1.7.4.1-r0