Make it build with ghc-9.10

[erikd]

Description

Add your description here, if it fixes a particular issue please provide a link to the issue.

Checklist

• Commit sequence broadly makes sense
• Commits have useful messages
• New tests are added if needed and existing tests are updated
• Any changes are noted in the changelog
• Code is formatted with fourmolu on version 0.10.1.0 (which can be run with scripts/fourmolize.sh)
• Self-reviewed the diff

Migrations

• The pr causes a breaking change of type a,b or c
• If there is a breaking change, the pr includes a database migration and/or a fix process for old values, so that upgrade is possible
• Resyncing and running the migrations provided will result in the same database semantically

If there is a breaking change, especially a big one, please add a justification here. Please elaborate
more what the migration achieves, what it cannot achieve or why a migration is not possible.

[erikd]

Tried to add ghc-9.10 to the build matrix, but that version does not seem to exist in the support GHC versions with the way CI is set up.

[angerman]

Questions I have:

• Do we really need the shell? Can we just use the DevX shell? I guess @sgillespie might have an idea about this.
• Must we pin the cabal version? Or can we just go with cabal = {}?

[angerman]

As @hamishmack pointed out in #1873, @sgillespie bumped cabal. I think we should combine this and #1873? @sgillespie, @erikd what do you think?

[angerman]

Let me reiterate my point about the version:

I'd rather just go with latest, that seems more robust.
and if we must pin a version have a clear comment that states why we pin the version.

[sgillespie]

Since adding GHC-9.10 to the GH action is ongoing, I'd like to go ahead and get this merged into master. We can add back the entry in the build matrix after we fix devx