Fix stale bot cache issue by adding actions:write permission

The stale workflow was experiencing a caching issue where issues were
being perpetually skipped with the message "skipped due being processed
during the previous run". This was caused by the workflow lacking the
actions:write permission needed to delete/update the cache between runs.

Without this permission, the stale action creates a cache of processed
issues but cannot delete or update it in subsequent runs, resulting in
a 403 error and issues getting stuck in a "perpetually processing" state.

This fix adds the actions:write permission as recommended in:
actions/stale#1131

Signed-off-by: Tom Pantelis <tompantelis@gmail.com>

Author: tpantelis

.github/workflows/stale.yml

@@ -15,6 +15,7 @@ jobs:
     permissions:
       issues: write
       pull-requests: write
+      actions: write
     steps:
       - uses: actions/stale@997185467fa4f803885201cee163a9f38240193d
         with: