Bump org.mockito:mockito-core from 5.13.0 to 5.21.0

Bumps [org.mockito:mockito-core](https://github.com/mockito/mockito) from 5.13.0 to 5.21.0.
- [Release notes](https://github.com/mockito/mockito/releases)
- [Commits](mockito/mockito@v5.13.0...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

@@ -18,7 +18,7 @@ dependencies {
     testRuntimeOnly 'org.junit.platform:junit-platform-launcher:1.12.2'
 
     // https://mvnrepository.com/artifact/org.mockito/mockito-core
-    testImplementation 'org.mockito:mockito-core:5.13.0'
+    testImplementation 'org.mockito:mockito-core:5.21.0'
 }