fix: cache github requests that include a host prefix

We were only caching GET requests that start with `repos/` and so this skipped URLs requested by our release-notes (CHANGELOG.md) function.

lib/platform/github/gh-got-wrapper.js

@@ -47,7 +47,11 @@ async function get(path, opts, retries = 5) {
         );
       }
     }
-    if (method === 'get' && path.startsWith('repos/')) {
+    if (
+      method === 'get' &&
+      (path.startsWith('repos/') ||
+        path.startsWith('https://api.github.com/repos/'))
+    ) {
       cache[path] = res;
     }
     return res;