fix(deps): update dependency org.mockito:mockito-android to v5.21.0

Author: renovate[bot]

gradle/libs.versions.toml

@@ -26,7 +26,7 @@ javaPoet = "1.13.0"
 json = "20250517"
 kotlin = "2.2.21"
 material = "1.13.0"
-mockitoAndroid = "5.20.0"
+mockitoAndroid = "5.21.0"
 mockitoKotlin = "6.1.0"
 mustacheJava = "0.9.14"
 navigationCompose = "2.9.6"