Merge pull request #1112 from square/renovate/mockk

Update dependency io.mockk:mockk to v1.13.9

Author: RBusarow

gradle/libs.versions.toml

@@ -67,7 +67,7 @@ material = "1.3.0"
 mockito-core = "3.12.4"
 mockito-kotlin = "3.2.0"
 
-mockk = "1.13.5"
+mockk = "1.13.9"
 robolectric = "4.10.3"
 
 rxjava2-android = "2.1.1"