Fix auto-cancel redundant docs jobs

Author: a2

.github/workflows/docs.yml

@@ -10,11 +10,7 @@ jobs:
     container: "norionomura/jazzy"
 
     steps:
-      - name: Cancel Previous Runs
-        uses: styfle/cancel-workflow-action@0.4.0
-        with:
-          access_token: ${{ github.token }}
-          workflow_id: 1778578
+      - uses: technote-space/auto-cancel-redundant-job@v1
       - uses: actions/checkout@v2
       - name: Run SourceKitten
         run: sourcekitten doc --spm-module SwiftShortcuts > SwiftShortcuts.json