pkgs-lib/hocon: fix type for `_includes` (#392854)

                path

                str

              ]);

              includeType = addCheck attrs (x: (x._type or null) == "include");

            in

            (oneOf [

              atomType

              (listOf atomType)

              (addCheck (listOf atomType) (lib.all atomType.check))

              (addCheck (listOf includeType) (lib.all includeType.check))

              (attrsOf type')

            ])

            // {