Bump org.mockito:mockito-junit-jupiter from 5.19.0 to 5.21.0

Bumps [org.mockito:mockito-junit-jupiter](https://github.com/mockito/mockito) from 5.19.0 to 5.21.0.
- [Release notes](https://github.com/mockito/mockito/releases)
- [Commits](mockito/mockito@v5.19.0...v5.21.0)

---
updated-dependencies:
- dependency-name: org.mockito:mockito-junit-jupiter
  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

@@ -16,7 +16,7 @@
     <!-- Dependency versions -->
     <junit.jupiter.version>6.0.1</junit.jupiter.version>
     <assertj.version>3.27.6</assertj.version>
-    <mockito.version>5.19.0</mockito.version>
+    <mockito.version>5.21.0</mockito.version>
 
     <!-- Plugin versions -->
     <spotless.version>3.1.0</spotless.version>