Bump mockito.version from 5.20.0 to 5.21.0

Bumps `mockito.version` from 5.20.0 to 5.21.0.

Updates `org.mockito:mockito-core` from 5.20.0 to 5.21.0
- [Release notes](https://github.com/mockito/mockito/releases)
- [Commits](mockito/mockito@v5.20.0...v5.21.0)

Updates `org.mockito:mockito-junit-jupiter` from 5.20.0 to 5.21.0
- [Release notes](https://github.com/mockito/mockito/releases)
- [Commits](mockito/mockito@v5.20.0...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

@@ -79,7 +79,7 @@
         <!-- Test dependencies -->
         <junit.version>5.12.2</junit.version>
         <assertj.version>3.27.6</assertj.version>
-        <mockito.version>5.20.0</mockito.version>
+        <mockito.version>5.21.0</mockito.version>
         <jmh.version>1.37</jmh.version>
         <jetty.version>11.0.26</jetty.version>
         <httpclient.version>4.5.14</httpclient.version>