ci: Fix quick-jobs GHC version to 9.6

[ulysses4ever]

Manual backport of #10026 . Other backports are stuck with red CI until this one is landed.

---

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).

[Kleidukos]

Good call, thanks.

[ulysses4ever]

Oh my, one of quick jobs is failing now in the actual check: https://github.com/haskell/cabal/actions/runs/9193944143/job/25286198767?pr=10043

Anyone has ideas what's going on?

[Kleidukos]

Extraneous parenthesis gets dropped:

-    = Z {zPackages :: ([ZPackage]),
-         zTools :: ([ZTool]),
+    = Z {zPackages :: [ZPackage],
+         zTools :: [ZTool],

[ulysses4ever]

that's interesting... why does it pass on master?..

[Kleidukos]

No idea, but indeed the parentheses are extraneous, and should be removed anyway.

[ulysses4ever]

@Mikolaj ideas?

[Mikolaj]

I forgot what this test does. If it passes on master, does it mean a backport that fixes it on master is missing?

[Mikolaj]

The test does this:

cabal/.github/workflows/quick-jobs.yml

Lines 52 to 60 in c6b2f1f

	- name: Regenerate files
	run: |
	make -B lexer
	make -B spdx
	make -B templates
	- name: Check that diff is clean
	run: |
	git status > /dev/null
	git diff-files -p --exit-code

[Mikolaj]

And the missing backport is #10041.

You are welcome. :)