just 'cross', drop the cargo, its cleaner

.github/workflows/release.yml

@@ -65,7 +65,7 @@ jobs:
       - uses: actions/checkout@v2
       - uses: taiki-e/install-action@v2
         with:
-          tool: cargo-cross
+          tool: cross
 
       - name: Install protobuf (Apt)
         run: sudo apt-get update && sudo apt-get install -y protobuf-compiler