Roll back hackage.nix to pre-alfred-margaret-2.1.1.0 pin

alfred-margaret-2.1.1.0 was uploaded to Hackage on 2026-04-24T11:44:40Z,
after the hackage.nix was already pinned to 2026-04-24T12:35:23Z. The
broken version (missing foldl' import) caused devShell builds to fail on
all platforms.

Roll back hackage.nix to 7037def9 (2026-04-08) which predates the broken
release. CHaP pin is unchanged — plutus-1.62.0.0 comes from CHaP, not
Hackage. Hackage index-state updated to match the reverted pin.

Author: Unisay

cabal.project

@@ -11,15 +11,9 @@ repository cardano-haskell-packages
 
 index-state:
   -- Bump both the following dates if you need newer packages from Hackage
-  , hackage.haskell.org 2026-04-24T10:35:23Z
+  , hackage.haskell.org 2026-04-08T17:40:10Z
   -- Bump this if you need newer packages from CHaP
   , cardano-haskell-packages 2026-04-24T12:33:57Z
 
--- alfred-margaret-2.1.1.0 accidentally dropped `import Data.Foldable (foldl')`
--- causing build failures on aarch64 with GHC 9.6. Remove once upstream is fixed.
--- See: https://github.com/channable/alfred-margaret/pull/76
-constraints:
-  alfred-margaret < 2.1.1.0
-
 packages:
   ./.