Add a new "stale" label for the stale-issues-prs GitHub action.

[yada]

Reason/Context

To implement .github/workflows/stale-issues-prs.yml as required for microcks/.github#16
We need to create the missing "stale" label on this repo.

Description

The stale-issues-prs.yml GitHub Action is designed to automatically manage inactive issues and pull requests in a repository. It typically:

1. Marks issues and pull requests as stale after a set period of inactivity (e.g., no comments or activity for a defined number of days).
2. Adds a stale label to these items to signal inactivity.
3. After another period of inactivity, it can close the stale issues or PRs if no further action is taken.
4. If there is activity on a stale item, the action removes the stale label and prevents it from closing.

This helps maintain a clean and active project by reducing the number of unresolved or inactive items.

Implementation ideas

Add (create) a new label on the repo:
Label name: stale
Description: State due to inactivity
Color: #cccccc (grey color)

[github-actions]

👋 @yada

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[yada]

Created:

and

done ✅