Always use api.github.com (#191)

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

Closes: #188

src/utils/constants.ts

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