chore: bump rollup from 4.20.0 to 4.21.0 (#416)

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](https://github.com/rollup/rollup/compare/v4.20.0...v4.21.0)

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

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

package.json

@@ -21,7 +21,7 @@
     "eslint": "^9.9.0",
     "jest": "^29.7.0",
     "prettier": "^3.3.3",
-    "rollup": "^4.20.0",
+    "rollup": "^4.21.0",
     "ts-jest": "^29.2.4",
     "tslib": "^2.6.3",
     "typescript": "^5.5.4",