CCM-10193 change to use GitHub app token

Signed-off-by: Tim Ireland <tim.ireland@hscic.gov.uk>

Author: timireland

.github/workflows/manual-proxy-environment-deploy.yaml

@@ -78,7 +78,6 @@ jobs:
         env:
           PROXYGEN_API_NAME: nhs-notify-supplier
           PR_NUMBER: ${{ steps.pr_exists.outputs.pr_number }}
-          PR_TRIGGER_PAT: ${{ secrets.PR_TRIGGER_PAT }}
         uses: ./.github/actions/build-proxies
         with:
           environment: "${{ env.ENVIRONMENT }}"