Change owner of Go-related workflows

Author: smowton

CODEOWNERS

@@ -41,3 +41,4 @@
 /.github/workflows/js-ml-tests.yml @github/codeql-ml-powered-queries-reviewers
 /.github/workflows/ql-for-ql-* @github/codeql-ql-for-ql-reviewers
 /.github/workflows/ruby-* @github/codeql-ruby
+/.github/workflows/go-* @github/codeql-go