Update Godot Android Library to use the stable version: 4.2.0.stable

[Lucas Moreira Carneiro de Miranda]

I propose a minor yet impactful update to the config.gradle to use the latest stable version . The aim is to remove the test code and 'TODO' comments from the samples, enhancing the codebase's clarity and maintainability. Here is the suggested update:

ext {
    versions = [
            gradlePluginVersion: '7.4.0',
            compileSdk         : 33,
            minSdk             : 21,
            targetSdk          : 33,
            javaVersion        : JavaVersion.VERSION_11,
            kotlinVersion      : '1.8.22',
    ]

    libraries = [
            godotAndroidLib: "org.godotengine:godot:4.2.0.stable",
    ]
}

This update aligns the project with the stable version of Godot (4.2.0.stable), ensuring better stability and compatibility.

[Fredia Huya-Kouadio]

Fixed by #7