Python workflow: revert to only release on tags

This reverts commit 1209584.

Author: orottier

.github/workflows/python.yaml

@@ -160,7 +160,7 @@ jobs:
   release:
     name: Release
     runs-on: ubuntu-latest
-    # if: "startsWith(github.ref, 'refs/tags/')"
+    if: "startsWith(github.ref, 'refs/tags/')"
     # needs: [linux, musllinux, windows, macos, sdist] # musl and linux ignored for now
     needs: [windows, macos, sdist]
     steps: