chore: update maturity section in README

Author: speakeasybot

README.md

@@ -648,8 +648,7 @@ s = Clerk(debug_logger=logging.getLogger("clerk_backend_api"))
 
 ## Maturity
 
-This SDK is in beta, and there may be breaking changes between versions without a major version update. Therefore, we recommend pinning usage
-to a specific package version. This way, you can install the same version each time without breaking changes unless you are intentionally
+This SDK is in GA. We recommend pinning usage to a specific package version. This way, you can install the same version each time without breaking changes between major versions unless you are intentionally
 looking for the latest version.
 
 ## Contributions