finalize-g4w-release: GitForWindowsHelper should be allowed implicitly

The GitForWindowsHelper GitHub App is not a member of the Git for
Windows organization per se, but it should be allowed to be the sender
(i.e. the account that triggered the workflow run) that implicitly
closes the `git-for-windows/git` PR corresponding to the just-released
Git for Windows version.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>

Author: dscho

GitForWindowsHelper/finalize-g4w-release.js

@@ -21,6 +21,7 @@ module.exports = async (context, req) => {
     })()
 
     const isAllowed = async (login) => {
+        if (login === 'gitforwindowshelper[bot]') return true
         const getCollaboratorPermissions = require('./get-collaborator-permissions')
         const token = await getToken()
         const permission = await getCollaboratorPermissions(context, token, owner, repo, login)