Update mixin, game provider, and fabric loader

gradle.properties

@@ -4,11 +4,11 @@ workspaceVersion = 4.0.0.0
 #dependencies that projects using WilderWorkspace will need in order to mod Wildermyth
 accessWidenerVersion = 2.1.0
 tinyMappingsVersion = 0.3.0+
-mixinVersion = 0.15.0+mixin.0.8.7
+mixinVersion = 0.15.4+mixin.0.8.7
 guavaVersion = 33.2.1-jre
-providerVersion = 1.4.1.0
+providerVersion = 1.5.0.0
 asmVersion = 9.7
-fabricLoaderVersion = 0.16.3
+fabricLoaderVersion = 0.16.8
 
 #dependencies for building and running WilderWorkspace gradle plugin itself
 commonsIOVersion = 2.16.1