set PropsWithChildren as explicit type on components

Signed-off-by: Oleg S <97077423+RobotSail@users.noreply.github.com>

plugins/techdocs/src/reader/components/useReaderState.test.tsx

@@ -26,7 +26,7 @@ import {
 } from './useReaderState';
 
 describe('useReaderState', () => {
-  let Wrapper: React.ComponentType;
+  let Wrapper: React.ComponentType<React.PropsWithChildren<{}>>;
 
   const techdocsStorageApi: jest.Mocked<typeof techdocsStorageApiRef.T> = {
     getApiOrigin: jest.fn(),

plugins/techdocs/src/reader/transformers/html/transformer.test.tsx

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-import React, { FC } from 'react';
+import React, { FC, PropsWithChildren } from 'react';
 import { renderHook } from '@testing-library/react-hooks';
 
 import { ConfigReader } from '@backstage/core-app-api';
@@ -31,7 +31,7 @@ const configApiMock: ConfigApi = new ConfigReader({
   },
 });
 
-const wrapper: FC = ({ children }) => (
+const wrapper: FC<PropsWithChildren<{}>> = ({ children }) => (
   <TestApiProvider apis={[[configApiRef, configApiMock]]}>
     {children}
   </TestApiProvider>