RDS, as PaaS, doesn't support all possible versions and each version has end-of-support date. When that date is reached, AWS will automatically upgrade minor versions. In your case 8.0.20 did reach it's end-of-support and got upgraded to 8.0.28 that will remain supported until June 2023.
Q: What happens when an RDS DB engine version is deprecated?
When a minor version of a database engine is deprecated in Amazon RDS, we will provide a three (3) month period after the announcement before beginning automatic upgrades. At the end of the this period, all instances still running the deprecated minor version will be scheduled for automatic upgrade to the latest supported minor version during their scheduled maintenance windows.
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