Replace with git module directly since its in allowlist

.github/workflows/cancel_duplicates.yml

@@ -19,19 +19,13 @@ jobs:
                    jq ".total_count")
           echo "Found $count unfinished jobs."
           echo "::set-output name=count::$count"
-          if [[ $count -gt 20 ]]; then
-            echo "will cancel duplicates.."
-            exit 0
+          if [[ $count -lt 20 ]]; then
+            echo "Less than 20 pending workflows runs, skip cancelling..."
+            exit 1
           fi
-          exit 1
+          echo "will cancel duplicates.."
 
-      - name: "Checkout ${{ github.ref }} ( ${{ github.sha }} )"
-        uses: actions/checkout@v2
-        with:
-          persist-credentials: false
-          submodules: recursive
-
-      - uses: ./.github/actions/cancel-workflow-runs/
+      - uses: potiuk/cancel-workflow-runs@953e057dc81d3458935a18d1184c386b0f6b5738
         name: "Cancel duplicate workflow runs"
         with:
           cancelMode: allDuplicates

.gitmodules

@@ -24,9 +24,6 @@
 [submodule ".github/actions/file-changes-action"]
 	path = .github/actions/file-changes-action
 	url = https://github.com/trilom/file-changes-action
-[submodule ".github/actions/cancel-workflow-action"]
-	path = .github/actions/cancel-workflow-action
-	url = https://github.com/styfle/cancel-workflow-action
 [submodule ".github/actions/cached-dependencies"]
 	path = .github/actions/cached-dependencies
 	url = https://github.com/apache-superset/cached-dependencies