Build/Test Tools: Change the cancel-workflow-action version to a SHA value.

Additionally, the `access_token` input now defaults to `github.token`, so specifying it is unnecessary.

Follow up to [50474].

Props johnbillion.
See #52625.

git-svn-id: https://develop.svn.wordpress.org/trunk@50476 602fd350-edb4-49c9-b593-d223f7449a82

.github/workflows/javascript-tests.yml

@@ -39,9 +39,7 @@ jobs:
     steps:
       - name: Cancel previous runs of this workflow (pull requests only)
         if: ${{ github.event_name == 'pull_request' }}
-        uses: styfle/cancel-workflow-action@0.8.0
-        with:
-          access_token: ${{ github.token }}
+        uses: styfle/cancel-workflow-action@3d86a7cc43670094ac248017207be0295edbc31d
 
       - name: Checkout repository
         uses: actions/checkout@v2