Switch to Paperweight Userdev beta instead of snapshot (#3485)

Author: SirYwell

gradle/libs.versions.toml

@@ -55,7 +55,7 @@ pluginyml = "0.6.0"
 mod-publish-plugin = "1.1.0"
 grgit = "5.3.3"
 shadow = "9.3.2"
-paperweight = "2.0.0-SNAPSHOT"
+paperweight = "2.0.0-beta.19"
 codecov = "0.2.0"