Adding a custom class to mantineTableHeadRowProps is not working

[williamneves]

mantine-react-table version

v2.0.0@alpha-10

react & react-dom versions

v^18.2.0

Describe the bug and the steps to reproduce it

I'm trying to modify the backgroundColor from the header, but inserting a new custom class to ``mantineTableHeadRowProps` on tableProps is not working:

mantineTableHeadRowProps: row =>({
      className: 'my-custom-class',
    }),

this is not working, the class is not added to the component.

Minimal, Reproducible Example - (Optional, but Recommended)

import 'mantine-react-table/styles.css'; //make sure MRT styles were imported in your app root (once)
import { useMemo } from 'react';
import {
  MantineReactTable,
  useMantineReactTable,
  type MRT_ColumnDef,
} from 'mantine-react-table';

type Person = {
  name: {
    firstName: string;
    lastName: string;
  };
  address: string;
  city: string;
  state: string;
};

//nested data is ok, see accessorKeys in ColumnDef below
const data: Person[] = [
  {
    name: {
      firstName: 'Zachary',
      lastName: 'Davis',
    },
    address: '261 Battle Ford',
    city: 'Columbus',
    state: 'Ohio',
  },
  {
    name: {
      firstName: 'Robert',
      lastName: 'Smith',
    },
    address: '566 Brakus Inlet',
    city: 'Westerville',
    state: 'West Virginia',
  },
  {
    name: {
      firstName: 'Kevin',
      lastName: 'Yan',
    },
    address: '7777 Kuhic Knoll',
    city: 'South Linda',
    state: 'West Virginia',
  },
  {
    name: {
      firstName: 'John',
      lastName: 'Upton',
    },
    address: '722 Emie Stream',
    city: 'Huntington',
    state: 'Washington',
  },
  {
    name: {
      firstName: 'Nathan',
      lastName: 'Harris',
    },
    address: '1 Kuhic Knoll',
    city: 'Ohiowa',
    state: 'Nebraska',
  },
];

const Example = () => {
  //should be memoized or stable
  const columns = useMemo<MRT_ColumnDef<Person>[]>(
    () => [
      {
        accessorKey: 'name.firstName', //access nested data with dot notation
        header: 'First Name',
      },
      {
        accessorKey: 'name.lastName',
        header: 'Last Name',
      },
      {
        accessorKey: 'address', //normal accessorKey
        header: 'Address',
      },
      {
        accessorKey: 'city',
        header: 'City',
      },
      {
        accessorKey: 'state',
        header: 'State',
      },
    ],
    [],
  );

  const table = useMantineReactTable({
    columns,
    data, //must be memoized or stable (useState, useMemo, defined outside of this component, etc.)
    mantineTableHeadRowProps: row =>({
      className: 'my-custom-class',
    }),
  });

  return <MantineReactTable table={table} />;
};