Replace deprecated jcenter() with mavenCentral()

[kkapytau]

Description

The project is currently using jcenter() as a repository in android/build.gradle.

However, JCenter has been deprecated and is no longer actively maintained, which may lead to dependency resolution issues or build failures.

Suggested change

Replace jcenter() with mavenCentral():

repositories {
    google()
-   jcenter()
+   mavenCentral()
}

Why this matters

jcenter() is deprecated and may become unavailable
mavenCentral() is the recommended alternative
Improves long-term stability of the build

Additional context

This change should be safe for most dependencies, as the majority are already available on Maven Central.