Fix the git archive format to match the archive file suffix.

When bazel try to install the repo, it uses the file prefix to determine how to extract the archive. If the format of the archive is not correct, bazel will fail when installing the repo.

PiperOrigin-RevId: 791662417

Author: jDramaix

.github/workflows/release_prep.sh

@@ -12,7 +12,7 @@ repository=${GITHUB_REPOSITORY#*/}
 directory="${repository}-${tag#v}"
 archive="${repository}-${tag}.tar.gz"
 
-git archive --format=tar --prefix=${directory}/ -o "${archive}" ${tag}
+git archive --format="tar.gz" --prefix=${directory}/ -o "${archive}" ${tag}
 
 # Replace hyphens with underscores in the repository name to match our Bazel
 # module naming conventions.