If the target RDS is not listed in "Certificate update" at the bottom left of the RDS console, I think there is no need to take any action.
If the certificate is still displayed under "Certificate update" even though it has already been updated, I recommend that you open a case with AWS Support under "Account and billing".
Inquiries under "Account and billing" can be made free of charge.
You have more information about this issue and other related issues regarding certificates in Amazon RDS here (even if the post is for an old certificate, the troubleshooting is similar):
How do I know which of my RDS DB instances are using the old certificate?
On the left navigation panel in the RDS console, there is now a Certificate update tab. Choose the tab to show a temporary page with your affected DB instances. This page will only show your affected DB instances when you select the appropriate AWS Region (if you switch to an AWS Region without affected DB instances, your table will be empty).
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