fix(deps): update dependency org.mockito:mockito-core to v4

Author: renovate[bot]

logback-android/build.gradle

@@ -53,7 +53,7 @@ dependencies {
 
     testImplementation 'org.hamcrest:hamcrest-junit:2.0.0.0'
     testImplementation 'org.robolectric:robolectric:4.9'
-    testImplementation 'org.mockito:mockito-core:2.28.2'
+    testImplementation 'org.mockito:mockito-core:4.8.1'
     testImplementation 'joda-time:joda-time:2.12.1'
 
     // This dep is required when using Robolectric and targeting pre-21 SDKs.