This version does not have any releases, so to use this, you will have to compile it.
Make sure you have a Java 17 JDK installed, then run "./gradlew build" for Unix(-like) OSes or "gradlew.bat build" for Windows. If the build was successful, the compiled JAR file should be in "build/libs".
Make sure you have the Fabric loader and Fabric API installed for version 1.20.2, and copy the JAR file to your mods folder.