cabal.project: Update index-state

Also remove `allow-newer` on aeson (its been fixed).

cabal.project

@@ -1,5 +1,5 @@
 -- See CONTRIBUTING for Nix commands you need to run if you change it:
-index-state: 2025-01-07T18:12:02Z
+index-state: 2025-01-15T07:17:48Z
 
 packages:
   cardano-prelude
@@ -9,11 +9,6 @@ test-show-details: direct
 
 if impl (ghc >= 9.12)
   allow-newer:
-    -- Stuck on `cabal-3.14` issues and recalcitrant maintainers
-    -- https://github.com/haskell/aeson/issues/1124
-    , aeson:ghc-prim
-    , aeson:template-haskell
-
     -- Stuck on `cabal-3.14` and unresponsive maintainers
     -- https://github.com/well-typed/cborg/pull/339
     , cborg:base