chore(deps): update dependency org.mockito:mockito-core to v5.21.0 (#1962)

Author: ggrossetie

server/pom.xml

@@ -19,7 +19,7 @@
     <opentelemetry.version>1.57.0</opentelemetry.version>
     <junit.jupiter.version>6.0.1</junit.jupiter.version>
     <assertj-core.version>3.27.6</assertj-core.version>
-    <mockito-core.version>5.20.0</mockito-core.version>
+    <mockito-core.version>5.21.0</mockito-core.version>
     <slf4j-api.version>2.0.17</slf4j-api.version>
     <maven.compiler.source>11</maven.compiler.source>
     <maven.compiler.target>11</maven.compiler.target>