docs: update code coverage badge

README.md

 # code-server · [!["GitHub Discussions"](https://img.shields.io/badge/%20GitHub-%20Discussions-gray.svg?longCache=true&logo=github&colorB=purple)](https://github.com/cdr/code-server/discussions) [!["Join us on Slack"](https://img.shields.io/badge/join-us%20on%20slack-gray.svg?longCache=true&logo=slack&colorB=brightgreen)](https://cdr.co/join-community) [![Twitter Follow](https://img.shields.io/twitter/follow/CoderHQ?label=%40CoderHQ&style=social)](https://twitter.com/coderhq)
 
-![Lines](https://img.shields.io/badge/Coverage-46.71%25-green.svg)
+![Lines](https://img.shields.io/badge/Coverage-40.7%25-green.svg)
 
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