OPSEXP-2364 Ensure release charts doesn't have pre-release dependencies

[gionn]

Ref: OPSEXP-2364

[alxgomz]

I would have checked that at release time only (so probably not with pre-commit) but otherwise LGTM.
Do you want to add more stuff (still in draft)?

[gionn]

I would have checked that at release time only (so probably not with pre-commit) but otherwise LGTM. Do you want to add more stuff (still in draft)?

this time really forgot because I was in a hurry :D

I put it in pre-commit because the check is fine to be always enforced: if you want to use an alpha dependency then you never want to release it with a non-alpha chart. (and of course it's very fast to check)