Recommend using latest cabal-install (backport #10013)

[mergify]

See #9901, recommend using the latest cabal-install either installed or not. Show examples of installing and running without first installing it.

• 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).

---

This is an automatic backport of pull request #10013 done by [Mergify](https://mergify.com).

[mergify]

Cherry-pick of de89ffe has failed:

On branch mergify/bp/3.12/pr-10013
Your branch is up to date with 'origin/3.12'.

You are currently cherry-picking commit de89ffe7f.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   CONTRIBUTING.md

no changes added to commit (use "git add" and/or "git commit -a")

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

[Mikolaj]

Docs only backport.

[Mikolaj]

Huh, but apparently we are missing some earlier backport here as well.