Fix broken link

I assume the repo moved?

README.md

@@ -88,7 +88,7 @@ Runs phpcs and phpstan if the `phpcs.xml.dist` or `phpstan.neon.dist` config fil
 `phplinting: false`
 
 ##### PHP coverage
-Run codecov, which does not require a configuration file. Default is false, though for CI runs on the silverstripe account this option will be ignored and codecov is set to run in [gha-generate-matrix](https://github.com/silvestripe/gha-matrix). Enable with:
+Run codecov, which does not require a configuration file. Default is false, though for CI runs on the silverstripe account this option will be ignored and codecov is set to run in [gha-generate-matrix](https://github.com/silverstripe/gha-generate-matrix). Enable with:
 `phpcoverage: true`
 
 ##### PHP coverage force off