CI/release: Replace actions-rs step with direct `run: cargo publish…

… ...` (#66)

Same as #63 but for the publish workflow, which was forgotten about.

.github/workflows/publish.yaml

@@ -11,12 +11,5 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v3
-      - uses: actions-rs/toolchain@v1
-        with:
-          toolchain: stable
-          override: true
       - name: Publish
-        uses: actions-rs/cargo@v1
-        with:
-          command: publish
-          args: --token ${{ secrets.cratesio_token }}
+        run: cargo publish --token ${{ secrets.cratesio_token }}