[CI/CD] close old issue missinformation

[MyDrift-user]

Type of Change

• Bug fix

Description

stale + closing message contains outdated time (it is not 7 days anymore)

• remove mention of how long it has been and simplify the message.

Checklist

• My code adheres to the coding and style guidelines of the project.
• I have performed a self-review of my own code.
• I have commented my code, particularly in hard-to-understand areas.
• I have made corresponding changes to the documentation.
• My changes generate no errors/warnings/merge conflicts.