Update dev-requirements.txt to specify ratelimit-stubs version from GitHub

* Changed the ratelimit-stubs entry to point to a specific version (2.2.1) hosted on GitHub, ensuring consistent dependency management for development.

Author: MikaKerman

dev-requirements.txt

@@ -9,7 +9,7 @@ networkx-stubs
 types-python-dateutil
 boto3-stubs
 google-auth-stubs
-ratelimit-stubs
+ratelimit-stubs @ git+https://github.com/isac322/ratelimit-stubs.git@2.2.1
 types-google-cloud-ndb
 types-protobuf
 types-pytz