use fixed cabal version per #10175

[geekosaur]

Implement #10175 by fixing cabal version to (for now) 3.12.1.* (originally 3.10.3.0 but that broke tests added post-3.10). We should decide when we should update this and record it and its rationale in the making-a-release wiki page.

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).

[geekosaur]

Some change in master requires 3.12.1.0 minimum for validate to pass. It'll be interesting to see if this backports… but since we're already preparing for 3.14, a backport isn't mandatory unless we retroactively declare 3.12 an LTS branch. Which might be necessary if we're going to release major versions on GHC's schedule.

[ulysses4ever]

Perfect! This should indeed resolve #10175

[Mikolaj]

Thank you.

[geekosaur]

@mergify backport 3.12

[mergify]

backport 3.12

✅ Backports have been created

• #10301 use fixed cabal version per #10175 (backport #10251) has been created for branch 3.12