docs: Update auth caching example to use functools.cached_property (#…

…2140)

docs/code_samples.md

@@ -240,16 +240,15 @@ class SingletonAuthStream(RESTStream):
 ### Make a stream reuse the same authenticator instance for all requests
 
 ```python
-from memoization import cached
+from functools import cached_property
 
 from singer_sdk.authenticators import APIAuthenticatorBase
 from singer_sdk.streams import RESTStream
 
 class CachedAuthStream(RESTStream):
     """A stream with singleton authenticator."""
 
-    @property
-    @cached
+    @cached_property
     def authenticator(self) -> APIAuthenticatorBase:
         """Stream authenticator."""
         return APIAuthenticatorBase(stream=self)