[NDR-313] Update env reference

Author: megan-bower4

.github/workflows/ndr-e2e-test-sandbox.yml

@@ -69,11 +69,9 @@ jobs:
 
       - name: Send Slack Notification
         uses: slackapi/slack-github-action@91efab103c0de0a537f72a35f6b8cda0ee76bf0a # Version v2.1.1
-        env:
-          SLACK_BOT_TOKEN: ${{ env.SLACK_BOT_TOKEN }}
         with:
           method: chat.postMessage
-          token: $SLACK_BOT_TOKEN
+          token: ${{ env.SLACK_BOT_TOKEN }}
           payload: |
             channel: ${{ vars.ALERTS_SLACK_CHANNEL_ID }}
             text: "Workflow has run"