Update dependency org.mockito:mockito-core to v5 (#18)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

pom.xml

@@ -26,7 +26,7 @@
     <!-- Compilation dependencies -->
     <java.version>1.8</java.version>
     <metrics.version>4.2.23</metrics.version>
-    <mockito.version>3.12.4</mockito.version>
+    <mockito.version>5.8.0</mockito.version>
     <okhttp.version>4.12.0</okhttp.version>
 
     <!-- Test dependencies -->