Updated badge

Author: filipecosta90

Readme.md

@@ -2,7 +2,7 @@
 
 
 [![codecov](https://codecov.io/gh/redis/redis-benchmarks-specification/branch/main/graph/badge.svg?token=GS64MV1H4W)](https://codecov.io/gh/redis/redis-benchmarks-specification)
-[![CI tests](https://github.com/redis/redis-benchmarks-specification/actions/workflows/tox.yml/badge.svg)](https://github.com/redis/redis-benchmarks-specification/actions/workflows/tox.yml)
+[![Run tox on Ubuntu 22.04](https://github.com/redis/redis-benchmarks-specification/actions/workflows/tox-self-hosted.yml/badge.svg)](https://github.com/redis/redis-benchmarks-specification/actions/workflows/tox-self-hosted.yml)
 [![PyPI version](https://badge.fury.io/py/redis-benchmarks-specification.svg)](https://pypi.org/project/redis-benchmarks-specification)
 
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