Disable react-in-jsx-scope rule

This rule returns an error if a JSX file doesn't have:

```
import React from 'react';
```

Since React 18 (I think) this hasn't been needed. We can remove the
rule and stop importing React.

.eslintrc.js

@@ -19,6 +19,7 @@ module.exports = {
     'react/jsx-max-props-per-line': ['warn', { when: 'multiline' }],
     'react/no-render-return-value': 'off',
     'react/prop-types': 'off', // No need for prop types with Typescript
+    'react/react-in-jsx-scope': 'off',
   },
   env: {
     browser: true,

package.json

@@ -1,6 +1,6 @@
 {
   "name": "eslint-config-fishbrain",
-  "version": "5.0.5",
+  "version": "5.0.6",
   "description": "ESLint config for Fishbrain TypeScript projects",
   "main": "index.js",
   "scripts": {