haskellPackages.persistent-postgresql: disable broken tests

Test suite can't currently be built with Stackage LTS-20.

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

@@ -1123,6 +1123,7 @@ self: super: {
   # Test suite requires database
   persistent-mysql = dontCheck super.persistent-mysql;
   persistent-postgresql =
+    # TODO: move this override to configuration-nix.nix
     overrideCabal
       (drv: {
         postPatch = drv.postPath or "" + ''
@@ -1131,8 +1132,14 @@ self: super: {
           sed -i test/PgInit.hs \
             -e s^'host=" <> host <> "'^^
         '';
-        # https://github.com/NixOS/nixpkgs/issues/198495
-        doCheck = pkgs.postgresql.doCheck;
+        doCheck =
+          # https://github.com/commercialhaskell/stackage/issues/6884
+          # persistent-postgresql-2.13.5.1 needs persistent-test >= 2.13.1.3 which
+          # is incompatible with the stackage version of persistent, so the tests
+          # are disabled temporarily.
+          false
+          # https://github.com/NixOS/nixpkgs/issues/198495
+          && pkgs.postgresql.doCheck;
         preCheck = drv.preCheck or "" + ''
           PGDATABASE=test
           PGUSER=test