chore(deps-dev): bump @typescript-eslint/eslint-plugin

Bumps [@typescript-eslint/eslint-plugin](https://github.com/typescript-eslint/typescript-eslint/tree/HEAD/packages/eslint-plugin) from 4.20.0 to 4.21.0.
- [Release notes](https://github.com/typescript-eslint/typescript-eslint/releases)
- [Changelog](https://github.com/typescript-eslint/typescript-eslint/blob/master/packages/eslint-plugin/CHANGELOG.md)
- [Commits](https://github.com/typescript-eslint/typescript-eslint/commits/v4.21.0/packages/eslint-plugin)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

package.json

@@ -54,7 +54,7 @@
  "@rollup/plugin-commonjs": "18.0.0",
  "@rollup/plugin-node-resolve": "11.2.1",
  "@typescript-eslint/parser": "4.20.0",
- "@typescript-eslint/eslint-plugin": "4.20.0",
+ "@typescript-eslint/eslint-plugin": "4.21.0",
  "babel-plugin-add-module-exports": "1.0.4",
  "eslint": "7.23.0",
  "eslint-config-google": "0.14.0",