pin cancel-workflow-action to specific SHA

Author: willnorris

.github/workflows/tests.yml

@@ -23,7 +23,7 @@ jobs:
 
     steps:
     - name: Cancel previous workflow runs
-      uses: styfle/cancel-workflow-action@0.8.0
+      uses: styfle/cancel-workflow-action@89f242ee29e10c53a841bfe71cc0ce7b2f065abc #0.9.0
       with:
         access_token: ${{ github.token }}