issue having labels for stale exemption

[davorpa]

keep is a label in the exemption matrix

[davorpa]

eventLoop...

• Created with stale, stale: closed and keep issue having labels for stale exemption #25 (comment)
• Updated the description
• Executed the workflow https://github.com/davorpa/free-programming-books/actions/runs/3026363566
  • Result: stale and stale:closed is removed issue having labels for stale exemption #25 (comment)
• Added manually: stale:closed is removed issue having labels for stale exemption #25 (comment)
• Executed the workflow https://github.com/davorpa/free-programming-books/actions/runs/3026434366
  • Result: stale and stale:closed is removed issue having labels for stale exemption #25 (comment)