Update dependency net.neoforged:neoforge to v21.3.39-beta

gradle.properties

@@ -18,7 +18,7 @@ minecraft_version=1.21.3
 # as they do not follow standard versioning conventions.
 minecraft_version_range=[1.21.3, 1.22)
 # The Neo version must agree with the Minecraft version to get a valid artifact
-neo_version=21.3.31-beta
+neo_version=21.3.39-beta
 # The Neo version range can use any version of Neo as bounds
 neo_version_range=[21.3.0-beta,)
 # The loader version range can only use the major version of FML as bounds