Remove unused local variable

PiperOrigin-RevId: 527284156
diff --git a/lib/src/builder.dart b/lib/src/builder.dart
index 2228941..45866fc 100644
--- a/lib/src/builder.dart
+++ b/lib/src/builder.dart
@@ -518,7 +518,6 @@
         throw InvalidMockitoAnnotationException(
             'Mockito cannot mock `dynamic`');
       }
-      final typeToMockElement = typeToMock.element;
       var type = _determineDartType(typeToMock, entryLib.typeProvider);
       if (type.alias == null) {
         // For a generic class without an alias like `Foo<T>` or