💚 misc(deps): check for existing branch upgrades

.github/workflows/upgrade-deps.yml

@@ -48,6 +48,22 @@ jobs:
           git config --global user.name "welpo"
           git config --global user.email "welpo@users.noreply.github.com"
 
+      - name: Check for existing branch
+        id: check_branch
+        run: |
+          if git ls-remote --heads origin deps/upgrade-${{ matrix.dependency }} | grep -q deps/upgrade-${{ matrix.dependency }}; then
+            echo "branch_exists=true" >> $GITHUB_OUTPUT
+          else
+            echo "branch_exists=false" >> $GITHUB_OUTPUT
+          fi
+
+      - name: Handle existing branch
+        if: steps.check_branch.outputs.branch_exists == 'true'
+        run: |
+          echo "Branch deps/upgrade-${{ matrix.dependency }} already exists."
+          echo "Skipping upgrade as there's already an open PR"
+          exit 0
+
       - name: Create and switch to new branch
         run: |
           git checkout -b deps/upgrade-${{ matrix.dependency }}