fix(ci): update goreleaser to use --clean flag (notaryproject#964)

Fix: replace `--rm-dist` with `--clean`

Goreleaser was updated to v6.0.0 in notaryproject#962. However the flag `--rm-dist` was deprecated in the latest version. Please see the details in the official document: https://goreleaser.com/deprecations/#-rm-dist
Test: the test release was successful

Signed-off-by: Junjie Gao <[email protected]>

.github/workflows/release-github.yml

@@ -50,6 +50,6 @@ jobs:
         with:
           distribution: goreleaser
           version: latest
-          args: release --rm-dist
+          args: release --clean
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}