chore(deps-dev): bump rollup from 4.20.0 to 4.21.0 (#1760)

Bumps [rollup](https://github.com/rollup/rollup) from 4.20.0 to 4.21.0.
- [Release notes](https://github.com/rollup/rollup/releases)
- [Changelog](https://github.com/rollup/rollup/blob/master/CHANGELOG.md)
- [Commits](rollup/rollup@v4.20.0...v4.21.0)

---
updated-dependencies:
- dependency-name: rollup
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

package.json

@@ -50,7 +50,7 @@
     "phantomjs-prebuilt": "2.1.16",
     "q": "1.5.1",
     "rimraf": "6.0.1",
-    "rollup": "4.20.0",
+    "rollup": "4.21.0",
     "rollup-plugin-esformatter": "3.1.0",
     "rollup-plugin-istanbul": "5.0.0",
     "rollup-plugin-license": "3.5.2",