Add missing actions: write permission to stale workflow

[Copilot]

Summary

This PR adds the missing actions: write permission to the stale job in the issue-management-stale-action.yml workflow.

Changes

Added actions: write permission to the stale job's permissions block with the trailing comment: # because actions/stale deletes its old cache before saving new one

The permission is placed in the correct order within the permissions block:

• After contents: read
• Before issues: write and pull-requests: write

Why this change is needed

The actions/stale action requires the actions: write permission to delete its old cache before saving a new one. Without this permission, the action may not function optimally.

Related

This change follows the same pattern and style used in other workflows in this repository, maintaining consistency with trailing comments on permissions.

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 #23

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