[MAINTENANCE] Ignore mockito 5.x as not supporting Java 8

Author: alien11689

.github/dependabot.yaml

@@ -34,6 +34,9 @@ updates:
       - dependency-name: "org.apache.openjpa:openjpa"
         versions:
           - ">=4.0.0" # does not support java 8
+      - dependency-name: "org.mockito:mockito*"
+        versions:
+          - ">=5.0.0" # does not support java 8
 
   - package-ecosystem: "maven"
     directory: "/application"