chore: AGP 8 compatibility

[Brazol]

This pull request includes several updates to the Android build configurations and dependency versions across multiple files. The main changes involve migrating from the old buildscript and apply plugin syntax to the newer plugins block, as well as updating various dependencies to their latest versions.

Build Configuration Updates:

• Migrated from buildscript and apply plugin to the plugins block in dogfooding/android/app/build.gradle, packages/stream_video_flutter/android/build.gradle, and packages/stream_video_push_notification/android/build.gradle. [1] [2] [3]
• Updated settings.gradle files to include Flutter plugin management and repository configurations. [1] [2] [3]

Dependency Updates:

• Updated Firebase and other dependencies in dogfooding/pubspec.yaml to their latest versions. [1] [2]
• Updated the thermal dependency in packages/stream_video/pubspec.yaml.

Code Simplification:

• Replaced whereNotNull() with nonNulls in open_api_extensions.dart and lobby_view.dart. [1] [2]

Manifest File Updates:

• Removed the package attribute from various AndroidManifest.xml files to simplify the manifest structure. [1] [2] [3] [4] [5] [6] [7]

[xsahil03x]

LGTM