fix(deps): Update dependency org.mockito:mockito-core to v5.21.0

Author: cq-bot

lib/build.gradle

@@ -49,7 +49,7 @@ dependencies {
     testImplementation platform('org.junit:junit-bom:6.0.0')
     testImplementation 'org.junit.jupiter:junit-jupiter:6.0.0'
     testImplementation 'org.junit.jupiter:junit-jupiter-api:6.0.0'
-    testImplementation 'org.mockito:mockito-core:5.20.0'
+    testImplementation 'org.mockito:mockito-core:5.21.0'
     testImplementation 'org.mockito:mockito-junit-jupiter:5.20.0'
     testImplementation 'nl.jqno.equalsverifier:equalsverifier:4.2.5'
     testImplementation 'org.assertj:assertj-core:3.27.6'