Update Fabric stuff

Author: Alexander01998

gradle.properties

@@ -6,11 +6,11 @@ org.gradle.parallel=true
 # check these at https://fabricmc.net/develop/ and
 # https://modrinth.com/mod/fabric-api/versions
 minecraft_version=1.21
-yarn_mappings=1.21+build.2
+yarn_mappings=1.21+build.4
 loader_version=0.15.11
 
 # Fabric API
-fabric_version=0.100.3+1.21
+fabric_version=0.100.4+1.21
 
 # Mod Properties
 mod_version = v7.43.2-MC1.21