Update gogs to fix ldap crash

Dockerfile

@@ -14,7 +14,7 @@ RUN mkdir -p ${GOPATH}/src/github.com/gogits && \
     cd ${GOPATH}/src/github.com/gogits && \
     git clone https://github.com/gogits/gogs.git && \
     cd gogs && \
-    git reset --hard 71fd10dd37af16ce540ae151b51faffbc3ef2d84 && \
+    git reset --hard 6235bd1fe9ed15c9a889f72e4fe2880189963306 && \
     go get ./... && \
     go build && \
     go install && \