Update with required inputs since gha is using the latest slack version anyway (#115)

Author: arinchoi03

.github/workflows/deploy-to-production.yml

@@ -123,6 +123,7 @@ jobs:
         uses: slackapi/slack-github-action@v2.1.1
         if: success()
         with:
+          webhook-type: webhook-trigger,
           payload: ${{ steps.slack_payload.outputs.payload }}
         env:
           SLACK_WEBHOOK_URL: ${{ secrets.TAX_ENG_SLACK_URL }}
@@ -206,6 +207,7 @@ jobs:
         uses: slackapi/slack-github-action@v2.1.1
         if: success()
         with:
+          webhook-type: webhook-trigger,
           payload: |
             {
               "text": ":mega: :sparkles: PYA production deploy ${{ job.status }} :sparkles: Please monitor infrastructure deploy: https://github.com/codeforamerica/tax-benefits-backend/actions/workflows/deploy.yaml\n<!subteam^S06P99RGJDS> <@U07QATMB6SW> <@U07Q39HFLBG>"