Add missing actions: write permission to stale workflow

[Copilot]

Problem

The stale workflow job was missing the actions: write permission, which is required by actions/stale@v10 to delete its old cache before saving a new one.

Solution

Added the actions: write permission to the stale workflow job's permissions block with an explanatory comment. The permission has been placed before issues: write and pull-requests: write to maintain a logical ordering.

Changes

Updated .github/workflows/stale.yaml to include:

permissions:
  actions: write # because actions/stale deletes its old cache before saving new one
  issues: write # required for labeling and closing stale issues
  pull-requests: write # required for labeling and closing stale PRs

This ensures the stale bot has all necessary permissions to function correctly.

Fixes #<issue_number>

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Add missing actions/stale permission</issue_title>
<issue_description>Check if any workflow jobs are using actions/stale.

If so, make sure that the permissions block for that job contains

actions: write

If any of the other permissions lines have trailing comments, then add a trailing comment for this one too:

actions: write # because actions/stale deletes its old cache before saving new one

Place this new permission in a specific order within the permissions, directly before both:

issues: write
pull-requests: write

(which implicitly means after contents: read)</issue_description>

Comments on the Issue (you are @copilot in this section)

Fixes #32

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