Fix continuous API doc artifact generation

Author: memowe

.github/workflows/haddock-pages.yml

@@ -41,11 +41,16 @@ jobs:
       run: mv $(find haddock_build -wholename '*doc/html/circular-enum' | head -n 1) $HADDOCK_DIR
 
     - name: Store generated API docs
-      uses: actions/upload-pages-artifact@v3
+      uses: actions/upload-artifact@v4
       with:
         name: Haddock API docs
         path: ${{ env.HADDOCK_DIR }}
 
+    - name: Prepare API docs for pages deployment
+      uses: actions/upload-pages-artifact@v3
+      with:
+        path: ${{ env.HADDOCK_DIR }}
+
   deploy:
     needs: haddock
     if: github.ref == 'refs/heads/main'