Update dependency com.vanniktech:gradle-maven-publish-plugin to v0.20.0

Author: renovate-bot

gradle/libs.versions.toml

@@ -66,7 +66,7 @@ square-workflow = "1.0.0"
 targetSdk = "30"
 taskTree = "2.1.0"
 
-vanniktech-publish = "0.19.0"
+vanniktech-publish = "0.20.0"
 
 [plugins]