Dockerfile: Update shfmt to 3.6.0

Signed-off-by: Paweł Gronowski <pawel.gronowski@docker.com>
(cherry picked from commit 4026148)
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

Dockerfile

@@ -237,7 +237,7 @@ RUN --mount=type=cache,target=/root/.cache/go-build \
      && /build/gotestsum --version
 
 FROM base AS shfmt
-ARG SHFMT_VERSION=v3.0.2
+ARG SHFMT_VERSION=v3.6.0
 RUN --mount=type=cache,target=/root/.cache/go-build \
     --mount=type=cache,target=/go/pkg/mod \
         GOBIN=/build/ GO111MODULE=on go install "mvdan.cc/sh/v3/cmd/shfmt@${SHFMT_VERSION}" \