Bump mockito-core from 2.28.2 to 3.0.0 (#4209)

Bump mockito-core from 2.28.2 to 3.0.0

build.gradle

@@ -298,7 +298,7 @@ dependencies {
 
     // dependencies for local unit tests
     testImplementation 'junit:junit:4.12'
-    testImplementation 'org.mockito:mockito-core:2.28.2'
+    testImplementation 'org.mockito:mockito-core:3.0.0'
     testImplementation 'androidx.test:core:1.2.0'
     testImplementation 'org.powermock:powermock-core:2.0.2'
     testImplementation 'org.powermock:powermock-module-junit4:2.0.2'