[VOL-2876]

Update grpc-gateway to a version with improved generation of swagger docs
Bump the golang and alpine image patch versions

Change-Id: Id8c772dd782b29586615d585a4cf6c756da0098c
diff --git a/docker/go-junit-report.Dockerfile b/docker/go-junit-report.Dockerfile
index 59aff65..7104498 100644
--- a/docker/go-junit-report.Dockerfile
+++ b/docker/go-junit-report.Dockerfile
@@ -12,7 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-FROM golang:1.13.8-alpine as build
+FROM golang:1.13.9-alpine as build
 
 RUN apk add --no-cache build-base=0.5-r1