chore: downgrade issues workflow

[just-boris]

Description

There is an issue with that release: https://github.com/cloudscape-design/board-components/actions/runs/14513780982/job/40718200512

Let's go back to the working v6 while they figure proper versioning: aws-actions/stale-issue-cleanup#265

Related links, issue #, if available: n/a

How has this been tested?

Successful run with v6 from my feature branch: https://github.com/cloudscape-design/board-components/actions/runs/14513991127/job/40718835195

Review checklist

The following items are to be evaluated by the author(s) and the reviewer(s).

Correctness

• Changes include appropriate documentation updates.
• Changes are backward-compatible if not indicated, see CONTRIBUTING.md.
• Changes do not include unsupported browser features, see CONTRIBUTING.md.
• Changes were manually tested for accessibility, see accessibility guidelines.

Security

• If the code handles URLs: all URLs are validated through the checkSafeUrl function.

Testing

• Changes are covered with new/existing unit tests?
• Changes are covered with new/existing integration tests?

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.66%. Comparing base (02ff49b) to head (438578c).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #350   +/-   ##
=======================================
  Coverage   93.66%   93.66%           
=======================================
  Files          68       68           
  Lines        3124     3124           
  Branches      670      670           
=======================================
  Hits         2926     2926           
  Misses        194      194           
  Partials        4        4           

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