Update mokkery

Author: simolus3

gradle/libs.versions.toml

@@ -39,7 +39,7 @@ skie = "0.10.2"
 maven-publish = "0.27.0"
 download-plugin = "5.5.0"
 grammarkit-composer = "0.1.12"
-mokkery = "2.7.1"
+mokkery = "2.8.0"
 kotlinter = "5.0.1"
 keeper = "0.16.1"
 atomicfu = "0.27.0"