feat: raise AGP to 8.2.0-rc03 and Gradle to 8.4

AGP RC is a tricky situation. Android API Level 34 stable has been
released yet targeting this version requires AGP 8.2, otherwise warnings
and potentially errors are bound to be encountered during builds. Seems
like Google moved ahead with Android 14 too early this time?

As of this commit, Android Studio Hedgehog is also in RC3, and its
release, alongside AGP 8.2, should be imminent, in which case this RC
version of AGP might very well be the final version and thus is safe to
use. This must be updated once the final version is actually released.

References https://outsystemsrd.atlassian.net/browse/RNMT-6402

framework/cdv-gradle-config-defaults.json

@@ -2,9 +2,9 @@
     "MIN_SDK_VERSION": 28,
     "SDK_VERSION": 34,
     "COMPILE_SDK_VERSION": null,
-    "GRADLE_VERSION": "8.3",
+    "GRADLE_VERSION": "8.4",
     "MIN_BUILD_TOOLS_VERSION": "34.0.0",
-    "AGP_VERSION": "8.1.1",
+    "AGP_VERSION": "8.2.0-rc03",
     "KOTLIN_VERSION": "1.9.10",
     "ANDROIDX_APP_COMPAT_VERSION": "1.6.1",
     "ANDROIDX_WEBKIT_VERSION": "1.7.0",