Deps: Move android test specific version to android test versions group

Author: ParaskP7

WordPressUtils/build.gradle

@@ -26,11 +26,11 @@ dependencies {
     testImplementation "androidx.test:core:$androidxTestCoreVersion"
 
     lintChecks "org.wordpress:lint:$wordpressLintVersion"
+
     androidTestImplementation "androidx.test:runner:$androidxTestCoreVersion"
     androidTestImplementation "androidx.test:rules:$androidxTestCoreVersion"
     androidTestImplementation "androidx.test.ext:junit:$jUnitExtVersion"
     androidTestImplementation "com.android.support.test.uiautomator:uiautomator-v18:$uiAutomatorVersion"
-
 }
 
 android {

build.gradle

@@ -50,7 +50,9 @@ ext {
     androidxTestCoreVersion = '1.4.0'
     assertjVersion = '3.11.1'
     junitVersion = '4.12'
-    jUnitExtVersion = '1.1.3'
     robolectricVersion = '4.9'
+
+    // android test
+    jUnitExtVersion = '1.1.3'
     uiAutomatorVersion = '2.1.2'
 }