chore: bump org.mockito:mockito-junit-jupiter from 5.20.0 to 5.21.0 (aws-powertools#2336)

Bumps [org.mockito:mockito-junit-jupiter](https://github.com/mockito/mockito) 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-junit-jupiter
  dependency-version: 5.21.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

pom.xml

@@ -114,7 +114,7 @@
         <versions-maven-plugin.version>2.20.1</versions-maven-plugin.version>
         <elastic.version>1.7.0</elastic.version>
         <mockito.version>5.20.0</mockito.version>
-        <mockito-junit-jupiter.version>5.20.0</mockito-junit-jupiter.version>
+        <mockito-junit-jupiter.version>5.21.0</mockito-junit-jupiter.version>
         <junit-pioneer.version>2.3.0</junit-pioneer.version>
         <crac.version>1.5.0</crac.version>