Rename GHE_DOTCOM to GHEC_DR

This more closely reflects the published naming https://docs.github.com/en/enterprise-cloud@latest/admin/data-residency/about-github-enterprise-cloud-with-data-residency

src/api-client.ts

@@ -125,7 +125,7 @@ export async function getGitHubVersionFromApi(
   }
 
   if (response.headers[GITHUB_ENTERPRISE_VERSION_HEADER] === "ghe.com") {
-    return { type: GitHubVariant.GHE_DOTCOM };
+    return { type: GitHubVariant.GHEC_DR };
   }
 
   const version = response.headers[GITHUB_ENTERPRISE_VERSION_HEADER] as string;