Update prerelease tag on correct workflow.

Author: kylc

.github/workflows/python.yaml

@@ -51,11 +51,6 @@ jobs:
         with:
           name: wheels-binary-${{ matrix.os }}-${{ matrix.target }}
           path: dist
-      - if: github.ref == 'refs/heads/main'
-        name: update prerelease tag
-        uses: EndBug/[email protected]
-        with:
-          ref: "prerelease"
 
   sdist:
     runs-on: ubuntu-latest
@@ -85,7 +80,10 @@ jobs:
           pattern: wheels-*
           merge-multiple: true
           path: wheels
-
+      - name: update prerelease tag
+        uses: EndBug/[email protected]
+        with:
+          ref: "prerelease"
       - name: GitHub release
         uses: ncipollo/[email protected]
         with: