Updates AGP to 9.1.0, Gradle to 9.5.0, and JDK to 21.

Android/build.gradle

@@ -5,9 +5,9 @@ buildscript {
         mavenCentral()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:4.2.2'
+        classpath 'com.android.tools.build:gradle:9.3.1'
 
-        def nav_version = "2.3.0"
+        def nav_version = "2.9.8"
         classpath "androidx.navigation:navigation-safe-args-gradle-plugin:$nav_version"
 
         // NOTE: Do not place your application dependencies here; they belong
@@ -15,15 +15,6 @@ buildscript {
     }
 }
 
-allprojects {
-    repositories {
-        google()
-        mavenCentral()
-        // maven { url "https://oss.jfrog.org/libs-snapshot" }
-        // maven { url 'http://repo1.maven.org/maven2' }
-    }
-}
-
 task clean(type: Delete) {
     delete rootProject.buildDir
 }