Bump Mockito to 2.28.2 and drop the A-C dependency

build.gradle

@@ -11,14 +11,13 @@ buildscript {
     // changing them. Please note that, for using in Android-Components, the
     // versions below must match the ones in that repository.
     ext.versions = [
-        android_components: '15.0.0',
         android_gradle_plugin: '3.5.3',
         android_maven_publish_plugin: '3.6.2',
         coroutines: '1.3.5',
         dokka: '0.9.17',
         jna: '5.2.0',
         junit: '4.12',
-        mockito: '2.24.5',
+        mockito: '2.28.2',  // This is different than a-c, but we're fine, it's only tests.
         mockwebserver: '3.10.0',
         kotlin: '1.3.71',
         robolectric: '4.2.1', // This is different than a-c, but we're fine, it's only tests.

glean-core/android/build.gradle

@@ -207,7 +207,6 @@ dependencies {
     testImplementation "org.mockito:mockito-core:$versions.mockito"
     testImplementation "androidx.test:core-ktx:$versions.androidx_core"
     testImplementation "com.squareup.okhttp3:mockwebserver:$versions.mockwebserver"
-    testImplementation "org.mozilla.components:support-test:$versions.android_components"
     testImplementation "androidx.work:work-testing:$versions.androidx_work"
 
     androidTestImplementation "androidx.test:runner:$versions.androidx_test"