Apple has released an updated build of iOS 14.5 to developers today. This comes after the release of beta 1 earlier this week. The new build released today is still referred to as beta 1, but it features a new build number.
The updated version iOS 14.5 beta 1 is available to developers via an over-the-air update in the Settings app. As usual, if the update does not immediately appear for download, keep checking, as it sometimes takes a few minutes to roll out to all registered developers.