Bump mockito-version from 5.20.0 to 5.21.0 (#283)

Author: dependabot[bot]

gradle/libs.versions.toml

@@ -10,7 +10,7 @@ unirest-version = "4.0.0-RC2"
 lombok-version = "1.18.42"
 junitVersion = "6.0.1"
 assertj-core-version = "3.27.6"
-mockito-version = "5.20.0"
+mockito-version = "5.21.0"
 
 shadow-version = "9.3.0"
 jib-version = "3.5.1"