🔧 build: bump AGP to 8.11.0, replace jcenter() with mavenCentral()

Author: FilipeMarch

pythonforandroid/bootstraps/common/build/templates/build.tmpl.gradle

@@ -2,17 +2,17 @@
 buildscript {
     repositories {
        google()
-       jcenter()
+       mavenCentral()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:8.1.1'
+        classpath 'com.android.tools.build:gradle:8.11.0'
     }
 }
 
 allprojects {
     repositories {
         google()
-        jcenter()
+        mavenCentral()
         {%- for repo in args.gradle_repositories %}
         {{repo}}
         {%- endfor %}