fix: remove redundant mv in release workflow

headlamp-plugin package already produces the tarball named
${PKG_NAME}-${VERSION}.tar.gz, so the mv was renaming the file
to itself and failing.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.github/workflows/release.yaml

@@ -71,7 +71,6 @@ jobs:
           VERSION="${{ inputs.version }}"
           PKG_NAME=$(jq -r .name package.json)
           TARBALL="${PKG_NAME}-${VERSION}.tar.gz"
-          mv *.tar.gz "$TARBALL"
           echo "TARBALL=$TARBALL" >> $GITHUB_ENV
           echo "PKG_NAME=$PKG_NAME" >> $GITHUB_ENV