Fix issue with omitted extension for antd icons

With `"type": "module"` in package.json most bundlers (e.g. webpack 5
and vite) expect an extension for referencing files directly inside
`node_modules`. I guess the safest way is to just import them directly
from the package.

Author: selaux

packages/antd/README.md

@@ -61,7 +61,7 @@ Ant Design theme, fields and widgets for `react-jsonschema-form`.
 ### Prerequisites
 
 - `antd >= 5`
-- `@ant-design/icons >= 5`
+- `@ant-design/icons >= 6`
 - `dayjs >= 1.8.0`
 - `@rjsf/core >= 6`
 - `@rjsf/utils >= 6`

packages/antd/src/templates/ErrorList/index.tsx

@@ -1,5 +1,5 @@
 import { Alert, List, Space } from 'antd';
-import ExclamationCircleOutlined from '@ant-design/icons/ExclamationCircleOutlined';
+import { ExclamationCircleOutlined } from '@ant-design/icons';
 import { ErrorListProps, FormContextType, RJSFSchema, StrictRJSFSchema, TranslatableString } from '@rjsf/utils';
 
 /** The `ErrorList` component is the template that renders the all the errors associated with the fields in the `Form`

packages/antd/src/templates/IconButton/index.tsx

@@ -1,9 +1,11 @@
 import { Button, ButtonProps } from 'antd';
-import ArrowDownOutlined from '@ant-design/icons/ArrowDownOutlined';
-import ArrowUpOutlined from '@ant-design/icons/ArrowUpOutlined';
-import CopyOutlined from '@ant-design/icons/CopyOutlined';
-import DeleteOutlined from '@ant-design/icons/DeleteOutlined';
-import PlusCircleOutlined from '@ant-design/icons/PlusCircleOutlined';
+import {
+  ArrowDownOutlined,
+  ArrowUpOutlined,
+  CopyOutlined,
+  DeleteOutlined,
+  PlusCircleOutlined,
+} from '@ant-design/icons';
 import {
   getUiOptions,
   FormContextType,