Fix typo in template action watcher script (#47286)

Summary:
Trivial typo - static analysis would have been a good thing.

Changelog: [Internal]

Pull Request resolved: https://github.com/facebook/react-native/pull/47286

Test Plan: eyes

Reviewed By: NickGerleman

Differential Revision: D65145600

Pulled By: blakef

fbshipit-source-id: 567ef3637441aa84651dce03f45b80068c5f4290

.github/workflow-scripts/utils.js

@@ -21,7 +21,7 @@ module.exports.sleep = sleep;
 
 async function getNpmPackageInfo(pkg, versionOrTag) {
   return fetch(`https://registry.npmjs.org/${pkg}/${versionOrTag}`).then(resp =>
-    res.json(),
+    resp.json(),
   );
 }
 module.exports.getNpmPackageInfo = getNpmPackageInfo;