feat: update api version to 0.6

Author: umarurize

src/endstone_example/example_plugin.py

@@ -10,7 +10,7 @@
 
 class ExamplePlugin(Plugin):
     prefix = "PythonExamplePlugin"
-    api_version = "0.5"
+    api_version = "0.6"
     load = "POSTWORLD"
 
     commands = {