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The release workflow targeted mroberts/sush, which does not exist
(`tea releases list --repo mroberts/sush` returns "not found"), so the
release step would fail after building the binaries. Present since the
workflow was added in a7a561f.
Also bump softprops/action-gh-release to v2 in the unused .github
workflow; actionlint rejects v1 as too old to run.