Revert "[Build] Remove JCenter as repository source"

This reverts commit b224e79.

build.gradle.kts

@@ -3,6 +3,8 @@ buildscript {
     repositories {
         google()
         mavenCentral()
+        // We need jcenter for the Xposed API...
+        jcenter()
     }
     dependencies {
         classpath("com.android.tools.build:gradle:8.0.1")
@@ -18,9 +20,11 @@ allprojects {
         google()
         mavenCentral()
         maven(url = "https://api.xposed.info/")
+        // See comment in buildscript repos
+        jcenter()
     }
 }
 
 tasks.register<Delete>("clean") {
     delete(rootProject.buildDir)
-}
+}