GMA Version 23.0.0 Update Issues

[jsligh]

Describe the bug
Google has released version 23.0.0 on 2024-03-07 which changes the minimum Android API level to 21 while Prebid still requires minimum API level 19.

Currently this has been fixed by pinning version 22.6.0 in #741 but this needs to be further addressed.
This will require all pubs to integrate Prebid with AdMob or GAM via Rendering API to update their GMA SDK.

We need to study the behavior of the original API with the new version of GMA SDK to make sure 23.0.0 doesn't break.

Proposed Solution
We need to find a way to allow publishers to not update their GMA SDK version if they do not want to. Support both older and newer GMA SDK versions.

[jsligh]

#752 will solve this. Has been discussed by the committee.