pythongh-106217: Trunkate the issue body size of new-bugs-announce-notifier

Author: sobolevn

.github/workflows/new-bugs-announce-notifier.yml

@@ -40,7 +40,10 @@ jobs:
                 url    : issue.data.html_url,
                 labels : issue.data.labels.map(label => { return label.name }).join(", "),
                 assignee : issue.data.assignees.map(assignee => { return assignee.login }),
-                body   : issue.data.body
+                // We need to trunkate the body size, because the max size for
+                // the whole payload is 16kb. We want to be safe and assume that
+                // body can take up to ~8kb of space.
+                body   : issue.data.body.substring(8000)
               };
 
               const data = {