Fix #10042 Don't recommend deprecated/removed 'extensions:' field

[mpilgrem]

trafficstars

Related issue:

• #10042

Include the following checklist in your PR:

• [x] Patches conform to the coding conventions.
• [x] Any changes that could be relevant to users have been recorded in the changelog.
• [x] The documentation has been updated, if necessary. Not necessary.
• [x] Manual QA notes have been included. None needed.
• [x] Tests have been added. (Ask for help if you don’t know how to write them! Ask for an exemption if tests are too complex for too little coverage!) None needed.

[mpilgrem]

I think the CI is failing for reasons unconnected with this pull request.

[geekosaur]

Yes, we're working on it.

[ulysses4ever]

@geekosaur I don't know that anyone is working on the changelog.d/GHC 9.10 failure btw! Maybe you could give it a try? Hécate suggested that instead of building it, we could just download a bindists...

[ulysses4ever]

I stand corrected: the changelog-d issue is being worked on here: https://github.com/haskell/cabal/pull/10048

[mpilgrem]

I've rebased on master.

[ulysses4ever]

@mpilgrem awesome! Per CONTRIBUTING.md, do you want to apply a merge label (either merge me or squash+merge). Squashing makes more sense, I think.

[mpilgrem]

I've tidied-up manually.

[ulysses4ever]

@mergify backport 3.12

[mergify[bot]]

backport 3.12

✅ Backports have been created

• #10078 Fix #10042 Don't recommend deprecated/removed 'extensions:' field (backport #10044) has been created for branch 3.12