Update badge for build status to new URL.

README.md

@@ -1,6 +1,6 @@
 # Spreed standalone signaling server
 
-![Build Status](https://github.com/strukturag/nextcloud-spreed-signaling/workflows/test/badge.svg)
+![Build Status](https://github.com/strukturag/nextcloud-spreed-signaling/actions/workflows/test.yml/badge.svg)
 [![Coverage Status](https://coveralls.io/repos/github/strukturag/nextcloud-spreed-signaling/badge.svg?branch=master)](https://coveralls.io/github/strukturag/nextcloud-spreed-signaling?branch=master)
 [![Documentation Status](https://readthedocs.org/projects/nextcloud-spreed-signaling/badge/?version=latest)](https://nextcloud-spreed-signaling.readthedocs.io/en/latest/?badge=latest)
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