Deactivate stale bot

[lczech]

Having a stale bot does not make issues go away, and just hides them the longer they have been unresolved, which is kind of the opposite of what should happen... Maybe consider removing the stale bot action.

For instance, this issue just got closed without any comments or fixes, but is not resolved, as far as I can tell. Stale bot recommended that I could re-open the issue if needed, but I don't seem to have the rights to do so.