build: update build to go v1.16.12

A Go net/http bug documented here
golang/go#50058 could potentially affect users
who enable Rook's webhook.

Signed-off-by: Blaine Gardner <blaine.gardner@redhat.com>

images/cross/Dockerfile

@@ -37,8 +37,8 @@ RUN DEBIAN_FRONTEND=noninteractive apt-get update && \
     DEBIAN_FRONTEND=noninteractive apt-get clean && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
 
 # install golang from the official repo
-RUN GO_VERSION=1.16.7 && \
-    GO_HASH=7fe7a73f55ba3e2285da36f8b085e5c0159e9564ef5f63ee0ed6b818ade8ef04 && \
+RUN GO_VERSION=1.16.12 && \
+    GO_HASH=7d657e86493ac1d5892f340a7d88b862b12edb5ac6e73c099e8e0668a6c916b7 && \
     curl -fsSL https://dl.google.com/go/go${GO_VERSION}.linux-amd64.tar.gz -o golang.tar.gz && \
     echo "${GO_HASH}  golang.tar.gz" | sha256sum -c - && \
     tar -C /usr/local -xzf golang.tar.gz && \