Bump mockito-core from 3.2.4 to 3.3.0 in /core (#2370)

Bumps [mockito-core](https://github.com/mockito/mockito) from 3.2.4 to 3.3.0.
- [Release notes](https://github.com/mockito/mockito/releases)
- [Commits](mockito/mockito@v3.2.4...v3.3.0)

Signed-off-by: dependabot-preview[bot] <[email protected]>

Author: rnorth

core/build.gradle

@@ -109,7 +109,7 @@ dependencies {
     testCompile 'redis.clients:jedis:3.2.0'
     testCompile 'com.rabbitmq:amqp-client:5.8.0'
     testCompile 'org.mongodb:mongo-java-driver:3.12.1'
-    testCompile ('org.mockito:mockito-core:3.2.4') {
+    testCompile ('org.mockito:mockito-core:3.3.0') {
         exclude(module: 'hamcrest-core')
     }
     // Synthetic JAR used for MountableFileTest and DirectoryTarResourceTest