fix: improve error caching behavoir (#2211)

This commit ensures that the GraphQL Pat error is not cached in any
browser. See
https://github.com/anuraghazra/github-readme-stats/issues/1471#issuecomment-1282630614.

api/pin.js

@@ -75,7 +75,7 @@ export default async (req, res) => {
       }),
     );
   } catch (err) {
-    res.setHeader("Cache-Control", `no-store`); // Don't cache error responses.
+    res.setHeader("Cache-Control", `no-cache, no-store, must-revalidate`); // Don't cache error responses.
     return res.send(renderError(err.message, err.secondaryMessage));
   }
 };