haskellPackages.hlibgit2: fix build after #28029

pkgs/development/haskell-modules/configuration-common.nix

···
   hgdbmi = dontCheck super.hgdbmi;
   hi = dontCheck super.hi;
   hierarchical-clustering = dontCheck super.hierarchical-clustering;
+  hlibgit2 = disableHardening super.hlibgit2 [ "format" ];
   hmatrix-tests = dontCheck super.hmatrix-tests;
   hquery = dontCheck super.hquery;
   hs2048 = dontCheck super.hs2048;