chore: update react imports

Signed-off-by: Paul Schultz <pschultz@pobox.com>

plugins/config-schema/dev/index.tsx

@@ -16,7 +16,6 @@
 
 import { createDevApp } from '@backstage/dev-utils';
 import { Schema } from 'jsonschema';
-import React from 'react';
 import Observable from 'zen-observable';
 import { configSchemaApiRef } from '../src/api';
 import { ConfigSchemaResult } from '../src/api/types';

plugins/config-schema/src/components/ConfigSchemaPage/ConfigSchemaPage.tsx

@@ -13,7 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import React, { useMemo } from 'react';
+import { useMemo } from 'react';
 import useObservable from 'react-use/esm/useObservable';
 import { configSchemaApiRef } from '../../api';
 import { SchemaViewer } from '../SchemaViewer';

plugins/config-schema/src/components/SchemaBrowser/SchemaBrowser.tsx

@@ -21,7 +21,7 @@ import ExpandMoreIcon from '@material-ui/icons/ExpandMore';
 import TreeItem, { TreeItemProps } from '@material-ui/lab/TreeItem';
 import TreeView from '@material-ui/lab/TreeView';
 import { Schema } from 'jsonschema';
-import React, { ReactNode, useMemo, useRef } from 'react';
+import { ReactNode, useMemo, useRef } from 'react';
 import { useScrollTargets } from '../ScrollTargetsContext';
 
 const StyledTreeItem = withStyles(theme =>

plugins/config-schema/src/components/SchemaView/SchemaView.tsx

@@ -26,7 +26,7 @@ import TableRow from '@material-ui/core/TableRow';
 import Typography from '@material-ui/core/Typography';
 import { makeStyles } from '@material-ui/core/styles';
 import { Schema } from 'jsonschema';
-import React, { useEffect, useRef } from 'react';
+import { useEffect, useRef } from 'react';
 import { useScrollTargets } from '../ScrollTargetsContext/ScrollTargetsContext';
 import { SchemaViewProps } from './types';
 

plugins/config-schema/src/components/SchemaViewer/SchemaViewer.test.tsx

@@ -16,7 +16,6 @@
 
 import { render, screen } from '@testing-library/react';
 import { Schema } from 'jsonschema';
-import React from 'react';
 import { SchemaViewer } from './SchemaViewer';
 
 describe('SchemaViewer', () => {

plugins/config-schema/src/components/SchemaViewer/SchemaViewer.tsx

@@ -17,7 +17,6 @@
 import Box from '@material-ui/core/Box';
 import Paper from '@material-ui/core/Paper';
 import { Schema } from 'jsonschema';
-import React from 'react';
 import { SchemaView } from '../SchemaView';
 import { SchemaBrowser } from '../SchemaBrowser';
 import { ScrollTargetsProvider } from '../ScrollTargetsContext/ScrollTargetsContext';

plugins/config-schema/src/components/ScrollTargetsContext/ScrollTargetsContext.tsx

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-import React, { createContext, ReactNode, useContext } from 'react';
+import { createContext, ReactNode, useContext } from 'react';
 
 class ScrollTargetsForwarder {
   private readonly listeners = new Map<string, () => void>();