deps(deps-dev): bump org.mockito:mockito-core from 4.8.1 to 5.20.0

Bumps [org.mockito:mockito-core](https://github.com/mockito/mockito) from 4.8.1 to 5.20.0.
- [Release notes](https://github.com/mockito/mockito/releases)
- [Commits](mockito/mockito@v4.8.1...v5.20.0)

---
updated-dependencies:
- dependency-name: org.mockito:mockito-core
  dependency-version: 5.20.0
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

qqq-backend-core/pom.xml

@@ -279,7 +279,7 @@
       <dependency>
          <groupId>org.mockito</groupId>
          <artifactId>mockito-core</artifactId>
-         <version>4.8.1</version>
+         <version>5.20.0</version>
          <scope>test</scope>
       </dependency>