Use correct CI badge URL

See docs https://docs.github.com/en/actions/monitoring-and-troubleshooting-workflows/monitoring-workflows/adding-a-workflow-status-badge.

Author: aeisenberg

README.md

@@ -6,7 +6,7 @@ The extension is released. You can download it from the [Visual Studio Marketpla
 
 To see what has changed in the last few versions of the extension, see the [Changelog](https://github.com/github/vscode-codeql/blob/main/extensions/ql-vscode/CHANGELOG.md).
 
-[![CI status badge](https://github.com/github/vscode-codeql/workflows/Build%20Extension/badge.svg)](https://github.com/github/vscode-codeql/actions?query=workflow%3A%22Build+Extension%22+branch%3Amain)
+[![CI status badge](https://github.com/github/vscode-codeql/actions/workflows/main.yml/badge.svg?branch=main)](https://github.com/github/vscode-codeql/actions?query=workflow%3A%22Build+Extension%22+branch%3Amain)
 [![VS Marketplace badge](https://vsmarketplacebadges.dev/version/github.vscode-codeql.svg)](https://marketplace.visualstudio.com/items?itemName=github.vscode-codeql)
 
 ## Features