Update to 1.21
Due to datapack format changes, this won't work on 1.20.6 and below (but updates beyond maintaining the pack for future versions are not planned, so I wouldn't worry too much)
Developer information
Projects on Modrinth are automatically available through a Maven repository for use with JVM build tools such as Gradle.
maven { name = "Modrinth"; url = "https://api.modrinth.com/maven" }