revert to MULTI_APPROVERS_TOKEN

Author: meltsufin

.github/workflows/multi_approvers.yaml

@@ -33,4 +33,4 @@ jobs:
         uses: 'abcxyz/actions/.github/actions/multi-approvers@986a6a133d0ffb38ab46a27c0777749a6735791a'
         with:
           team: 'multi-approvers'
-          token: '${{ secrets.GITHUB_TOKEN }}'
+          token: '${{ secrets.MULTI_APPROVERS_TOKEN }}'