Upgrade to Hugo 0.82.1 (googleforgames#2085)

I got annoyed by this flakiness, so decided to do something about it.

Doing a check over the website, all looks exactly the same as per usual.

Closes googleforgames#1981

build/build-image/Dockerfile

@@ -77,7 +77,7 @@ RUN curl -sfL https://install.goreleaser.com/github.com/golangci/golangci-lint.s
 #     \_/\_/ \___|_.__/|___/_|\__\___|
 #
 
-ENV HUGO_VER 0.73.0
+ENV HUGO_VER 0.82.1
 RUN mkdir /tmp/hugo && \
     wget -q -O /tmp/hugo/hugo.tar.gz https://github.com/gohugoio/hugo/releases/download/v${HUGO_VER}/hugo_extended_${HUGO_VER}_Linux-64bit.tar.gz && \
     tar -zxvf /tmp/hugo/hugo.tar.gz -C /tmp/hugo/ && \