readme: update CI badge

Author: jcarpent

README.md

@@ -4,7 +4,7 @@
 
 <p align="center">
   <a href="https://opensource.org/licenses/BSD-2-Clause"><img src="https://img.shields.io/badge/License-BSD%202--Clause-green.svg" alt="License"/></a>
-  <a href="https://github.com/jcarpent/proxqp-unofficial/actions/workflows/ci-linux-osx-with-conda.yml"><img src="https://github.com/jcarpent/proxqp-unofficial/actions/workflows/ci-linux-osx-with-conda.yml/badge.svg" alt="CI - Linux/OSX/Windows - Conda"></a>
+  <a href="https://github.com/Simple-Robotics/proxsuite/actions/workflows/ci-linux-osx-win-conda.yml"><img src="https://github.com/Simple-Robotics/proxsuite/actions/workflows/ci-linux-osx-win-conda.yml/badge.svg?branch=main" alt="CI - Linux/OSX/Windows - Conda"></a>
   <a href="https://badge.fury.io/py/proxsuite"><img src="https://badge.fury.io/py/proxsuite.svg" alt="PyPI version" height="20"></a>
 </p>