Always use api.github.com

The octokit client would default to the URL of enterprise instances and then not be able to find the ruff repo.

src/utils/constants.ts

@@ -1,3 +1,4 @@
 export const REPO = "ruff";
 export const OWNER = "astral-sh";
 export const TOOL_CACHE_NAME = "ruff";
+export const GITHUB_COM_API = "https://api.github.com";