Bump mockito-core from 2.23.0 to 2.23.4

Bumps [mockito-core](https://github.com/mockito/mockito) from 2.23.0 to 2.23.4.
- [Release notes](https://github.com/mockito/mockito/releases)
- [Commits](mockito/mockito@v2.23.0...v2.23.4)

---
updated-dependencies:
- dependency-name: org.mockito:mockito-core
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

pom.xml

@@ -405,7 +405,7 @@
             <dependency>
                 <groupId>org.mockito</groupId>
                 <artifactId>mockito-core</artifactId>
-                <version>2.23.0</version>
+                <version>2.23.4</version>
             </dependency>
             <dependency>
                 <groupId>org.objenesis</groupId>