Dockerfile: update download URL for nydus snapshotter

The repository was renamed to https://github.com/dragonflyoss/nydus,
and while GitHub does provide redirects, their services have been
a bit flaky recently so sometimes the redirects would fail.

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
(cherry picked from commit b3f79c2)

Author: thaJeztah

Dockerfile

@@ -316,7 +316,7 @@ ARG NYDUS_VERSION
 ARG TARGETOS
 ARG TARGETARCH
 SHELL ["/bin/bash", "-c"]
-RUN wget https://github.com/dragonflyoss/image-service/releases/download/$NYDUS_VERSION/nydus-static-$NYDUS_VERSION-$TARGETOS-$TARGETARCH.tgz
+RUN wget https://github.com/dragonflyoss/nydus/releases/download/$NYDUS_VERSION/nydus-static-$NYDUS_VERSION-$TARGETOS-$TARGETARCH.tgz
 RUN mkdir -p /out/nydus-static && tar xzvf nydus-static-$NYDUS_VERSION-$TARGETOS-$TARGETARCH.tgz -C /out
 
 FROM gobuild-base AS gotestsum