upgrade tor v0.4.3.5 -> v0.4.3.7 (diff links below)

https://gitweb.torproject.org/tor.git/plain/ChangeLog

https://git.alpinelinux.org/aports/commit/community/tor?id=3a247b9dbce3988d52b1a17a3d0bb5f1dc9b4863

removes support for zstd-compressed directory traffic from armhf builds:
https://git.alpinelinux.org/aports/commit/?id=2849fa38b9a76d1ef0a9df10aa70bafa00a5ab27

Dockerfile

@@ -1,7 +1,7 @@
-FROM alpine:3.12
+FROM alpine:3.12.2
 
 ARG GETTEXT_PACKAGE_VERSION=0.20.2-r0
-ARG TOR_PACKAGE_VERSION=0.4.3.5-r0
+ARG TOR_PACKAGE_VERSION=0.4.3.7-r0
 RUN apk add --no-cache \
         tor=$TOR_PACKAGE_VERSION \
         gettext=$GETTEXT_PACKAGE_VERSION \