workflows/release: switch to attestations

Signed-off-by: William Woodruff <[email protected]>

Author: woodruffw

.github/workflows/release.yml

@@ -33,9 +33,5 @@ jobs:
 
     - name: publish
       uses: pypa/gh-action-pypi-publish@release/v1
-
-    - name: sign
-      uses: sigstore/[email protected]
       with:
-        inputs: ./dist/*.tar.gz ./dist/*.whl
-        release-signing-artifacts: true
+        attestations: true