Bump index-state in the release project file

[ulysses4ever]

I have backports failing on 3.12 because the index state update from #9897 is not on 3.12: https://github.com/haskell/cabal/actions/runs/9080152427/job/24950912901?pr=10002

Does it look reasonable to backport this change? @ffaf1 @Mikolaj

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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).

[Mikolaj]

Yes, I think the bumped index has been tested enough on master by now. Am I missing any other problems with that bump?

[ulysses4ever]

I hope not. My worry is that #9897 is big and some other changes in it may need to be backported as well.

[Mikolaj]

I hope not. My worry is that #9897 is big and some other changes in it may need to be backported as well.

IIRC a big part of that was boostrap fixes and then there was a followup PR of precisely that. This is a nightmare to debug and 3.12 will never be used for boostrapping, so I'd propose not to try to update bootstrapping and if it starts failing due to other changes (e.g., version bumps), just disable it in CI.

Edit: or at least in theory we provide boostraps only on master branch. I hope users don't try to use others.