fix(deps): update mockito monorepo to v5.20.0

Author: renovate[bot]

settings.gradle.kts

@@ -37,7 +37,7 @@ dependencyResolutionManagement {
 
             // Testing dependencies
             version("junit", "6.0.0")
-            version("mockito", "5.19.0")
+            version("mockito", "5.20.0")
             version("mockbukkit", "3.133.2")
             version("assertj", "3.27.6")