build(deps-dev): bump mockito.version from 5.17.0 to 5.21.0

Bumps `mockito.version` from 5.17.0 to 5.21.0.

Updates `org.mockito:mockito-core` from 5.17.0 to 5.21.0
- [Release notes](https://github.com/mockito/mockito/releases)
- [Commits](mockito/mockito@v5.17.0...v5.21.0)

Updates `org.mockito:mockito-junit-jupiter` from 5.17.0 to 5.21.0
- [Release notes](https://github.com/mockito/mockito/releases)
- [Commits](mockito/mockito@v5.17.0...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
- 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

@@ -29,7 +29,7 @@
     <assertj.version>3.27.7</assertj.version>
     <junit-jupiter.version>5.10.5</junit-jupiter.version>
     <junit-pioneer.version>2.3.0</junit-pioneer.version>
-    <mockito.version>5.17.0</mockito.version>
+    <mockito.version>5.21.0</mockito.version>
     <!-- Plugins -->
     <maven-clean-plugin.version>3.2.0</maven-clean-plugin.version>
     <maven-compiler-plugin.version>3.12.1</maven-compiler-plugin.version>