chore(deps-dev): bump rollup in the rollup group across 1 directory (#…

…5667)

Bumps the rollup group with 1 update in the / directory: [rollup](https://github.com/rollup/rollup).


Updates `rollup` from 4.18.0 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@v4.18.0...v4.21.0)

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

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

package.json

@@ -84,7 +84,7 @@
     "postcss-cli": "^11.0.0",
     "prettier": "^3.3.3",
     "prettier-plugin-astro": "^0.14.1",
-    "rollup": "^4.18.0",
+    "rollup": "^4.21.0",
     "rtlcss": "^4.1.1",
     "sass": "^1.77.4",
     "stylelint": "^16.8.2",