upgrade openssh-server package 8.3_p1-r0 -> 8.3_p1-r1 (patches CVE-2020-14145)

https://ubuntu.com/security/CVE-2020-14145
https://git.alpinelinux.org/aports/commit/?id=20ed8327b9ee7b0920813b009bcbd8001f07a3b5

Dockerfile

@@ -1,7 +1,7 @@
 FROM alpine:3.12
 
 ARG RSYNC_PACKAGE_VERSION=3.1.3-r3
-ARG OPENSSH_SERVER_PACKAGE_VERSION=8.3_p1-r0
+ARG OPENSSH_SERVER_PACKAGE_VERSION=8.3_p1-r1
 RUN apk add --no-cache \
     openssh-server=$OPENSSH_SERVER_PACKAGE_VERSION \
     rrsync=$RSYNC_PACKAGE_VERSION \