build(deps): Bump org.mockito:mockito-core in /backend

Bumps [org.mockito:mockito-core](https://github.com/mockito/mockito) from 5.16.0 to 5.16.1.
- [Release notes](https://github.com/mockito/mockito/releases)
- [Commits](mockito/mockito@v5.16.0...v5.16.1)

---
updated-dependencies:
- dependency-name: org.mockito:mockito-core
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

backend/build.gradle

@@ -103,7 +103,7 @@ dependencies {
 	testImplementation slf4jDependency
 
 	// https://mvnrepository.com/artifact/org.mockito/mockito-core
-	testImplementation group: 'org.mockito', name: 'mockito-core', version: '5.16.0'
+	testImplementation group: 'org.mockito', name: 'mockito-core', version: '5.16.1'
 }
 
 // --------------- Version Injection ---------------