fix dependabot[bot] id

Author: meltsufin

.github/workflows/multi_approvers.yaml

@@ -40,6 +40,6 @@ jobs:
           #   release-please[bot]: 55107282
           #   cloud-java-bot: 122572305
           #   gcf-owl-bot[bot]: 78513119
-          #   dependabot[bot]: 27347476
+          #   dependabot[bot]: 49699333
           #   yoshi-code-bot: 70984784
           #   yoshi-automation: 44816363