AGP 8 compatibility

[tigrenok00]

Please support AGP 8 so we can upgrade:

FAILURE: Build completed with 2 failures.
[ +1 ms] 1: Task failed with an exception.
[ ] -----------
[ ] * What went wrong:
[ ] A problem occurred configuring project ':connectycube_flutter_call_kit'.
[ ] > Could not create an instance of type com.android.build.api.variant.impl.LibraryVariantBuilderImpl.
[ ] > Namespace not specified. Specify a namespace in the module's build file. See https://d.android.com/r/tools/upgrade-assistant/set-namespace for information about setting the namespace.
[ ] If you've specified the package attribute in the source AndroidManifest.xml, you can use the AGP Upgrade Assistant to migrate to the namespace value in the build file. Refer to
https://d.android.com/r/tools/upgrade-assistant/agp-upgrade-assistant for general information about using the AGP Upgrade Assistant.

[CubeRomanMagellan]

Thanks for reporting. Yes, we will update AGP in the next release.

[CubeRomanMagellan]

@tigrenok00, we've released callkit v. 2.8.0 with update AGP to 8.9.0