chore: Add changeset

.changeset/breezy-waves-develop.md

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+---
+"@guardian/cdk": patch
+---
+
+fix(experimental-ec2-pattern): Add buffer to rolling update timeout
+
+If we consider the health check grace period to be the time it takes the "normal" user data to run,
+the rolling update should be configured to be a little longer to cover the additional time spent polling the target group.
+
+A buffer of 1 minute is somewhat arbitrarily chosen.
+Too high a value, then we increase the time it takes to automatically rollback from a failing healthcheck.
+Too low a value, then we risk flaky deploys.