Make sourcejar actually contain sources in kommons-mc

kommons-mc/build.gradle.kts

@@ -34,6 +34,12 @@ tasks.jar {
     from(zipTree(project(":guava").tasks.jar.get().outputs.files.asPath))
 }
 
+tasks.sourceJar {
+    from(project(":").sourceSets.main.get().allSource)
+    from(project(":gson").sourceSets.main.get().allSource)
+    from(project(":guava").sourceSets.main.get().allSource)
+}
+
 minecraft {
     mappings("official", "1.20.2")
 }