[Dependabot]: Bump org.mockito:mockito-core from 5.17.0 to 5.21.0

Bumps [org.mockito:mockito-core](https://github.com/mockito/mockito) 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:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

build.gradle

@@ -112,7 +112,7 @@ dependencies {
     testRuntimeOnly 'org.junit.platform:junit-platform-launcher'
 
     // Mocking libraries
-    testImplementation group: 'org.mockito', name: 'mockito-core', version: '5.17.0'
+    testImplementation group: 'org.mockito', name: 'mockito-core', version: '5.21.0'
     testImplementation group: 'org.wiremock', name: 'wiremock', version: '3.12.1'
 
     // Wait test utility