Cardano Updates

Cabal needs git on PATH for source-repository-package stanzas in
cabal.project files. Without it, builds fail with Cabal-6666.

This was observed in IntersectMBO/cardano-db-sync#2085 where 6 out of 9
failing CI jobs reported "The program 'git' is required but it could not
be found."

Add gitMinimal (146 MiB closure) instead of git (1.5 GiB) to all four
shell definitions — the same package nixpkgs uses for fetchgit. The 10x
smaller closure matters for container images built from devx shells.

- dynamic.nix: add gitMinimal to buildInputs, drop redundant git from
  withGHCTooling (gitMinimal now covers it)
- static.nix: add gitMinimal to nativeBuildInputs
- cross-js.nix: add gitMinimal to nativeBuildInputs
- cross-windows.nix: add pkgsBuildBuild.gitMinimal to nativeBuildInputs

Flake lock file updates:

• Updated input 'haskellNix':
    'github:input-output-hk/haskell.nix/cc939d0' (2026-02-23)
  → 'github:input-output-hk/haskell.nix/597653d' (2026-03-21)
• Removed input 'haskellNix/cabal-32'
• Updated input 'haskellNix/hackage':
    'github:input-output-hk/hackage.nix/06f38c7' (2026-02-23)
  → 'github:input-output-hk/hackage.nix/1c09fd8' (2026-03-21)
• Updated input 'haskellNix/hackage-for-stackage':
    'github:input-output-hk/hackage.nix/2d5bbb1' (2026-02-23)
  → 'github:input-output-hk/hackage.nix/b31c1cd' (2026-03-21)
• Updated input 'haskellNix/stackage':
    'github:input-output-hk/stackage.nix/862226e' (2026-02-23)
  → 'github:input-output-hk/stackage.nix/4f65f24' (2026-03-21)
• Updated input 'iohk-nix':
    'github:input-output-hk/iohk-nix/a704b93' (2025-11-12)
  → 'github:input-output-hk/iohk-nix/0ce7cc2' (2026-02-02)