Bump index state to allow tar-0.6.3.0

tar-0.6.3.0 has much improved performance of deserialising .tar index
which has significant ramifications for the start-up time of
cabal-install.

See #10110

cabal.release.project

@@ -2,4 +2,4 @@ import: project-cabal/pkgs/cabal.config
 import: project-cabal/pkgs/install.config
 import: project-cabal/pkgs/tests.config
 
-index-state: hackage.haskell.org 2024-04-22T06:16:57Z
+index-state: hackage.haskell.org 2024-06-17T00:00:01Z