build(deps-dev): bump org.mockito:mockito-core from 5.18.0 to 5.21.0

Bumps [org.mockito:mockito-core](https://github.com/mockito/mockito) from 5.18.0 to 5.21.0.
- [Release notes](https://github.com/mockito/mockito/releases)
- [Commits](mockito/mockito@v5.18.0...v5.21.0)

---
updated-dependencies:
- dependency-name: org.mockito:mockito-core
  dependency-version: 5.21.0
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

pom.xml

@@ -53,7 +53,7 @@
         <maven-plugin-plugin.version>3.15.2</maven-plugin-plugin.version>
 
         <junit.version>5.13.4</junit.version>
-        <mockito.version>5.18.0</mockito.version>
+        <mockito.version>5.21.0</mockito.version>
 
         <assertj.version>3.27.7</assertj.version>
     </properties>