fix: update mocha version to 10.3.0

Author: Sembauke

mobile-app/lib/ui/views/learn/test_runner.dart

@@ -33,7 +33,7 @@ class TestRunner extends BaseViewModel {
 
     List<String> imports = [
       '<script src="https://unpkg.com/[email protected]/chai.js"></script>',
-      '<script src="https://unpkg.com/mocha@10.8.2/mocha.js"></script>',
+      '<script src="https://unpkg.com/mocha@10.3.0/mocha.js"></script>',
       '<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.6.0/jquery.min.js"></script>',
       '<link rel="stylesheet" href="https://unpkg.com/mocha/mocha.css" />'
     ];