[skip netlify]: 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]>

Author: dependabot[bot]

ember-resize-modifier/package.json

@@ -53,7 +53,7 @@
     "eslint-plugin-prettier": "^5.1.3",
     "prettier": "^3.2.5",
     "prettier-plugin-ember-template-tag": "^2.0.2",
-    "rollup": "^4.20.0",
+    "rollup": "^4.21.0",
     "rollup-plugin-copy": "^3.5.0"
   },
   "publishConfig": {