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

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]>

package.json

@@ -88,7 +88,7 @@
     "npm-run-all": "=4.1.5",
     "prettier": "=3.3.3",
     "rimraf": "=6.0.1",
-    "rollup": "=4.20.0",
+    "rollup": "=4.21.0",
     "rollup-plugin-dts": "=6.1.1",
     "sinon": "=18.0.0",
     "terser-webpack-plugin": "=5.3.10",