Bump org.mockito:mockito-core from 5.20.0 to 5.21.0 (#63)

Bumps [org.mockito:mockito-core](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-core
  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]

build.gradle

@@ -48,7 +48,7 @@ subprojects {
         testImplementation 'org.junit.jupiter:junit-jupiter'
         testRuntimeOnly 'org.junit.platform:junit-platform-launcher'
         testImplementation 'org.assertj:assertj-core:3.27.6'
-        testImplementation 'org.mockito:mockito-core:5.20.0'
+        testImplementation 'org.mockito:mockito-core:5.21.0'
     }
 
     test {