Bump org.mockito:mockito-core from 5.10.0 to 5.15.2

Bumps [org.mockito:mockito-core](https://github.com/mockito/mockito) from 5.10.0 to 5.15.2.
- [Release notes](https://github.com/mockito/mockito/releases)
- [Commits](mockito/mockito@v5.10.0...v5.15.2)

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

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

build.gradle

@@ -448,7 +448,7 @@ dependencies {
     testRuntimeOnly 'org.junit.jupiter:junit-jupiter-engine:5.10.2'
 
     // For mocking features during unit tests
-    testImplementation group: 'org.mockito', name: 'mockito-core', version: '5.10.0'
+    testImplementation group: 'org.mockito', name: 'mockito-core', version: '5.15.2'
 
     // flexmark markdown parsing / conversion
     implementation 'com.vladsch.flexmark:flexmark-all:0.64.8'

clientserver/build.gradle

@@ -39,7 +39,7 @@ dependencies {
     testImplementation 'org.junit.jupiter:junit-jupiter-params:5.10.2'
     testRuntimeOnly 'org.junit.jupiter:junit-jupiter-engine:5.10.2'
     // For mocking features during unit tests
-    testImplementation group: 'org.mockito', name: 'mockito-core', version: '5.10.0'
+    testImplementation group: 'org.mockito', name: 'mockito-core', version: '5.15.2'
 }
 
 test {