fix(android): fix name clash when building with Gradle 7

[tido64]

Description

Fixes a name clash when building the test app with Gradle 7:

A problem occurred evaluating script.
> No signature of method: static test_app_2f7bqu5tkk9dawnfc468sfds4.apply() is applicable for argument types: (LinkedHashMap) values: [[from:/~/node_modules/react-native-test-app/android/test-app-util.gradle]]
  Possible solutions: apply(groovy.lang.Closure), apply(java.util.Map), any(), copy(groovy.lang.Closure), copy(org.gradle.api.Action), any(groovy.lang.Closure)

Platforms affected

• Android
• iOS
• macOS
• Windows

Test plan

CI should pass.