Apple has launched a signature update for the old app to make it available on IOS / iPad OS 14.5

Some Apple iPhone users may have noticed that some apps that haven't been updated for a long time have been suddenly updated recently. One of the possibilities is that developers are actually working, and more likely, apple is officially updating.
Apple is currently updating code signing certificates for older apps to enable them to run on IOS / iPad OS 14.5.
Apple has launched a signature update for the old app to make it available on IOS / iPad OS 14.5
This update does not require the developer to re sign the deployment. Instead, Apple will officially issue a new signature. Users will receive a "this app has been updated with the latest signature certificate by Apple".
In addition, apple warned developers of these old apps to release new versions as soon as possible.