CI: cabal-head prerelease: move to a current GitHub Action

[ulysses4ever]

I don't believe we need to backport it since cabal-head only concerns master.

Explanation of the changes (based on the docs for the new action):

• title will be the same as tag (cabal-head)
• auth token has a default value that should work, I hope.

Template B: This PR does not modify behaviour or interface

E.g. the PR only touches documentation or tests, does refactorings, etc.

Include the following checklist in your PR:

• Patches conform to the coding conventions.
• Is this a PR that fixes CI? If so, it will need to be backported to older cabal release branches (ask maintainers for directions).

[ulysses4ever]

I also petition to skip the 2-day delay so that our CI doesn't look red for longer than needed.