Revert "Update gogs to 0.9.71"

This reverts commit 9ea791848ffcd7bd2864c64db5ef29e96fe215a2.

There is a regression wrt adding SSH Keys.

"Sorry, we're not able to verify your SSH key: extractTypeFromBase64Key: invalid key format: <nil>"

Dockerfile

@@ -15,7 +15,7 @@ RUN passwd -d git
 RUN mkdir -p /home/git/gogs
 ## TODO: use redis as well
 RUN cd /home/git/gogs && \
-    curl -L https://github.com/gogits/gogs/releases/download/v0.9.71/linux_amd64.tar.gz | tar zxvf - --strip-components 1
+    curl -L https://github.com/gogits/gogs/releases/download/v0.9.48/linux_amd64.tar.gz | tar zxvf - --strip-components 1
 
 # setup config paths
 ADD app.ini.template /home/git/app.ini.template