chore: add librarian bot to multi approvers allowed list (#2101)

Signed-off-by: ldetmer <[email protected]>

Author: ldetmer

.github/workflows/multi_approvers.yaml

@@ -39,7 +39,7 @@ jobs:
         with:
           team: 'googlers'
           token: '${{ secrets.MULTI_APPROVERS_TOKEN }}'
-          user-id-allowlist: '25180681,55107282,122572305,78513119,49699333,70984784,44816363,205009765,56741989'
+          user-id-allowlist: '25180681,55107282,122572305,78513119,49699333,70984784,44816363,205009765,56741989,224858768'
           # username to ID mapping (https://api.github.com/users/{username}):
           #   renovate-bot: 25180681
           #   release-please[bot]: 55107282
@@ -50,3 +50,4 @@ jobs:
           #   yoshi-automation: 44816363
           #   google-cloud-sdk-librarian-dotnet-robot: 205009765
           #   copybara-service[bot]: 56741989
+          #   cloud-sdk-librarian-robot: 224858768