[Fix] fix unstable plugin reference with flat configs #1038
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The previous use of spread meant that
```ts
import jsxA11y from 'eslint-plugin-jsx-a11y';
jsxA11y !== jsxA11y.flatConfigs.recommended.plugins['jsx-a11y']
```
This is a problem because if someone does something like this
```js
import jsxA11y from 'eslint-plugin-jsx-a11y';
export default [
{ plugins: { 'jsx-a11y': jsxA11y } },
jsxA11y.flatConfigs.recommended,
];
```
then ESLint will crash with the error `Config "jsx-a11y/recommended": Key "plugins": Cannot redefine plugin "jsx-a11y".`
This PR fixes that by using `Object.assign` to mutate the `jsxA11y` object and maintain referential equality.
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The previous use of spread meant that
This is a problem because if someone does something like this
then ESLint will crash with the error
Config "jsx-a11y/recommended": Key "plugins": Cannot redefine plugin "jsx-a11y".This PR fixes that by using
Object.assignto mutate thejsxA11yobject and maintain referential equality.