Bump @rollup/plugin-commonjs from 20.0.0 to 21.0.0 (#30)

Bumps [@rollup/plugin-commonjs](https://github.com/rollup/plugins/tree/HEAD/packages/commonjs) from 20.0.0 to 21.0.0.
- [Release notes](https://github.com/rollup/plugins/releases)
- [Changelog](https://github.com/rollup/plugins/blob/master/packages/commonjs/CHANGELOG.md)
- [Commits](https://github.com/rollup/plugins/commits/commonjs-v21.0.0/packages/commonjs)

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

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

package.json

@@ -23,7 +23,7 @@
     "@babel/core": "^7.15.5",
     "@babel/preset-env": "^7.15.6",
     "@rollup/plugin-babel": "^5.3.0",
-    "@rollup/plugin-commonjs": "^20.0.0",
+    "@rollup/plugin-commonjs": "^21.0.0",
     "@rollup/plugin-eslint": "^8.0.1",
     "@rollup/plugin-node-resolve": "^13.0.5",
     "autoprefixer": "^10.3.6",