Bump Cabal-syntax bound to let it work with cabal 3.10 and 3.11dev

[Mikolaj]

I plan to just revise this on Hackage for both packages.

[andreasabel]

CI used Cabal-syntax 3.8.1.0 https://github.com/haskell/hackage-security/pull/290/checks#step:15:818:

PkgId (PkgName "hackage-security") (Ver [0,6,2,3])
CompNameTest "TestSuite"
Cabal-3.8.1.0

I tested these packages locally with GHC 9.6.1 alpha3 without problem. So maybe this Cabal-syntax bump could be combined with a bump to GHC 9.6, to get CI to pick up at least 3.9.0.0... I started on this:

• Bumps for GHC 9.6 #291

[Mikolaj]

Yes, that would be great. And let's not forget to revise this on Hackage (at least the essential parts).

[andreasabel]

And let's not forget to revise this on Hackage (at least the essential parts).

Did that: #291 (comment)

[Mikolaj]

Thank you so much. Closing as superseded by #291.