Update rust workflow to use trusted publishing (#280)

Author: cmmarslender

.github/workflows/rust.yml

@@ -156,10 +156,14 @@ jobs:
         env:
           GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
 
+      - uses: rust-lang/crates-io-auth-action@v1
+        if: env.RELEASE == 'true'
+        id: auth
+
       - name: Publish to crates.io
         if: env.RELEASE == 'true'
         env:
-          CARGO_REGISTRY_TOKEN: ${{ secrets.cargo_registry_token }}
+          CARGO_REGISTRY_TOKEN: ${{ steps.auth.outputs.token }}
         # See comment above for why `--allow-dirty` is used.
         run: |
           cp -r src rust_bindings/cpp