Bump @rollup/plugin-commonjs from 19.0.0 to 21.0.1 (#403)

Bumps [@rollup/plugin-commonjs](https://github.com/rollup/plugins/tree/HEAD/packages/commonjs) from 19.0.0 to 21.0.1.
- [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-v21.0.1/packages/commonjs)

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

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

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

Author: dependabot[bot]

package-lock.json

@@ -54,7 +54,7 @@
     "@babel/preset-typescript": "^7.12.7",
     "@esm-bundle/chai": "^4.3.4",
     "@open-wc/testing": "^3.0.3",
-    "@rollup/plugin-commonjs": "^19.0.0",
+    "@rollup/plugin-commonjs": "^21.0.1",
     "@rollup/plugin-node-resolve": "^13.0.0",
     "@types/sinon": "^10.0.0",
     "@typescript-eslint/eslint-plugin": "^4.16.1",