chore: update multi-approvers to use GitHub team

Author: meltsufin

.github/workflows/multi_approvers.yaml

@@ -18,6 +18,7 @@ on:
 permissions:
   actions: 'write'
   contents: 'read'
+  id-token: 'write'
   pull-requests: 'read'
 
 concurrency:
@@ -26,6 +27,10 @@ concurrency:
 
 jobs:
   multi-approvers:
-    uses: 'abcxyz/pkg/.github/workflows/multi-approvers.yml@1d1cedf7768d17dde23bb2cda24bc1fb950e9f92'
-    with:
-      org-members-path: 'googleapis/google-auth-library-java/main/.github/workflows/members.json'
+    runs-on: 'ubuntu-latest'
+    steps:
+      - name: 'Multi-approvers'
+        uses: 'abcxyz/pkg/.github/actions/multi-approvers'
+        with:
+          team: 'multi-approvers'
+          token: '${{ secrets.MULTI_APPROVERS_TOKEN }}'