ci: give write permissions to reminder

[JacobCoffee]

Description

• Deployminder sometimes fails due to permissions I think https://github.com/python/psf-salt/actions/runs/11259227771/job/31307708334?pr=510

[ewdurbin]

Interesting... why would they succeed sometimes without it?

[JacobCoffee]

@ewdurbin that is my confusion here as well :\ going off of https://stackoverflow.com/a/70448851 to narrow the cause

[ewdurbin]

Doesn't appear that this worked