Bump rollup-plugin-css-only from 3.1.0 to 4.3.0 (#2424)

Bumps [rollup-plugin-css-only](https://github.com/thgh/rollup-plugin-css-only) from 3.1.0 to 4.3.0.
- [Release notes](https://github.com/thgh/rollup-plugin-css-only/releases)
- [Changelog](https://github.com/thgh/rollup-plugin-css-only/blob/v4/CHANGELOG.md)
- [Commits](https://github.com/thgh/rollup-plugin-css-only/commits)

---
updated-dependencies:
- dependency-name: rollup-plugin-css-only
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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

package.json

@@ -52,7 +52,7 @@
     "prettier": "2.7.1",
     "prettier-plugin-svelte": "2.4.0",
     "rollup": "2.79.1",
-    "rollup-plugin-css-only": "3.1.0",
+    "rollup-plugin-css-only": "4.3.0",
     "rollup-plugin-livereload": "2.0.5",
     "rollup-plugin-string": "^3.0.0",
     "rollup-plugin-svelte": "7.1.6",