Update head hackage cabal repository sha256

This fixes the error:

    error: hash mismatch in fixed-output derivation '/nix/store/...-head.hackage.ghc.haskell.org.drv':
    specified: sha256-+hzciiQqWb5oOzQ2JZ2lzJGfGuwA3ZigeWgAQ8Dz+kk=
          got:    sha256-YVcHIBJ8qo2fCBkuRM+vCVVoEEzGcFqNPMukSCBbcJw=

Author: sgillespie

tool-map.nix

@@ -15,7 +15,7 @@ let
              f76d08be13e9a61a377a85e2fb63f4c5435d40f8feb3e12eb05905edb8cdea89
              26021a13b401500c8eb2761ca95c61f2d625bfef951b939a8124ed12ecf07329
              7541f32a4ccca4f97aea3b22f5e593ba2c0267546016b992dfadcd2fe944e55d
-          --sha256: sha256-+hzciiQqWb5oOzQ2JZ2lzJGfGuwA3ZigeWgAQ8Dz+kk=
+          --sha256: sha256-YVcHIBJ8qo2fCBkuRM+vCVVoEEzGcFqNPMukSCBbcJw=
 
         if impl(ghc < 9.13)
           active-repositories: hackage.haskell.org