Fix CI badge in README (#149)

Author: pquentin

README.md

@@ -3,7 +3,7 @@
 [![PyPI](https://img.shields.io/pypi/v/elastic-transport)](https://pypi.org/elastic-transport)
 [![Python Versions](https://img.shields.io/pypi/pyversions/elastic-transport)](https://pypi.org/elastic-transport)
 [![PyPI Downloads](https://static.pepy.tech/badge/elastic-transport)](https://pepy.tech/project/elastic-transport)
-[![CI Status](https://img.shields.io/github/workflow/status/elastic/elastic-transport-python/CI/main)](https://github.com/elastic/elastic-transport-python/actions)
+[![CI Status](https://img.shields.io/github/actions/workflow/status/elastic/elastic-transport-python/ci.yml)](https://github.com/elastic/elastic-transport-python/actions)
 
 Transport classes and utilities shared among Python Elastic client libraries