Bumps alpine from 3.13.2 to 3.13.3. Signed-off-by: dependabot[bot] <support@github.com>
@@ -1,4 +1,4 @@
-FROM alpine:3.13.2
+FROM alpine:3.13.3
ARG DOVECOT_PACKAGE_VERSION=2.3.13-r0
ARG SOCAT_PACKAGE_VERSION=1.7.4.1-r0