upload-snapshot: queue the Check Run using a valid token

The `getToken()` method does not need any parameters when being called
in `slash-commands.js` because there, the `owner`/`repo` values are
obvious. But when triggering an `upload-snapshot` workflow, we are
juggling three different repositories, therefore we absolutely need to
specify for which repository the token needs to target.

This was the _actual_ reason why the `upload-snapshot` run was not
triggered after v2.48.1 was released, the conclusions I drew in
#124 were
incorrect.

Signed-off-by: Johannes Schindelin <[email protected]>

Author: dscho

GitForWindowsHelper/cascading-runs.js

@@ -354,7 +354,7 @@ const handlePush = async (context, req) => {
     const tagGitCheckRunTitle = `Upload snapshot Git @${commit}`
     const tagGitCheckRunId = await queueCheckRun(
         context,
-        await getToken(),
+        await getToken(context, pushOwner, pushRepo),
         pushOwner,
         pushRepo,
         commit,