ci: update release-plz configuration (#72)

- use the latest documented configuration
- setup actual release of crate to crates.io

Resolves #71

.github/workflows/release-plz.yml

@@ -1,22 +1,27 @@
 name: release-plz
 
+permissions:
+  pull-requests: write
+  contents: write
+
 on:
   push:
     branches:
       - main
 
 jobs:
   release-plz:
-    name: release-plz
+    name: Release-plz
     runs-on: ubuntu-latest
     steps:
       - name: Checkout repository
         uses: actions/checkout@v3
         with:
           fetch-depth: 0
+      - name: Install Rust toolchain
+        uses: dtolnay/rust-toolchain@stable
       - name: Run release-plz
-        uses: MarcoIeni/release-plz-action@main
-        with:
-          command: release-pr
+        uses: MarcoIeni/[email protected]
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          CARGO_REGISTRY_TOKEN: ${{ secrets.CARGO_REGISTRY_TOKEN }}