Update ci roll notification email

Change-Id: Idab28086e7b48020d40fce9d57bcb5aeccf6e9d7
Bug: https://github.com/flutter/flutter/issues/86945
Reviewed-on: https://flutter-review.googlesource.com/c/recipes/+/17942
Reviewed-by: Casey Hillers <chillers@google.com>
Commit-Queue: Keyong Han <keyonghan@google.com>

recipes/infra/ci_yaml.py

diff --git a/recipes/infra/ci_yaml.py b/recipes/infra/ci_yaml.py
index e83fe2e..481cef9 100644
--- a/recipes/infra/ci_yaml.py
+++ b/recipes/infra/ci_yaml.py
@@ -109,8 +109,7 @@
             gerrit_project = 'infra',
             repo_dir = infra_path,
             commit_message = 'Roll %s to %s' % (repo, git_ref),
-            # TODO(chillers): Change to oncall group. https://github.com/flutter/flutter/issues/86945
-            cc_on_failure = 'chillers@google.com',
+            cc_on_failure = 'flutter-infra@grotations.appspotmail.com',
         )