community[patch]: Add missing annotations (#24890)

This PR adds annotations in comunity package.

Annotations are only strictly needed in subclasses of BaseModel for
pydantic 2 compatibility.

This PR adds some unnecessary annotations, but they're not bad to have
regardless for documentation pages.

libs/community/langchain_community/callbacks/upstash_ratelimit_callback.py

@@ -58,7 +58,7 @@ class UpstashRatelimitHandler(BaseCallbackHandler):
     every time you invoke.
     """
 
-    raise_error = True
+    raise_error: bool = True
     _checked: bool = False
 
     def __init__(