Bump @wordpress/eslint-plugin from 18.1.0 to 20.3.0

Bumps [@wordpress/eslint-plugin](https://github.com/WordPress/gutenberg/tree/HEAD/packages/eslint-plugin) from 18.1.0 to 20.3.0.
- [Release notes](https://github.com/WordPress/gutenberg/releases)
- [Changelog](https://github.com/WordPress/gutenberg/blob/trunk/packages/eslint-plugin/CHANGELOG.md)
- [Commits](https://github.com/WordPress/gutenberg/commits/@wordpress/[email protected]/packages/eslint-plugin)

---
updated-dependencies:
- dependency-name: "@wordpress/eslint-plugin"
  dependency-type: direct:development
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

package.json

@@ -14,7 +14,7 @@
     "@babel/core": "^7.23.2",
     "@wordpress/babel-preset-default": "^7.22.0",
     "@wordpress/env": "^8.10.0",
-    "@wordpress/eslint-plugin": "^18.1.0",
+    "@wordpress/eslint-plugin": "^20.3.0",
     "babel-loader": "^9.1.3",
     "grunt": "^1.6.1",
     "grunt-contrib-clean": "^2.0.1",