Go download link has changed

I was noticing a flakiness in the download of the
go language installer. This change in download
location should fix this.

build/build-image/Dockerfile

@@ -49,7 +49,7 @@ RUN wget -q https://static.rust-lang.org/rustup/archive/1.11.0/${RUST_ARCH}/rust
 WORKDIR /usr/local
 ENV GO_VERSION=1.11.4
 ENV GOPATH /go
-RUN wget -q https://redirector.gvt1.com/edgedl/go/go${GO_VERSION}.linux-amd64.tar.gz && \
+RUN wget -q https://dl.google.com/go/go${GO_VERSION}.linux-amd64.tar.gz && \
     tar -xzf go${GO_VERSION}.linux-amd64.tar.gz && rm go${GO_VERSION}.linux-amd64.tar.gz && mkdir ${GOPATH}
 
 # install gcloud + kubectl, because it's an easy way to test/dev against kubernetes.