chore(deps-dev): bump rollup from 2.7.6 to 2.9.1

Bumps [rollup](https://github.com/rollup/rollup) from 2.7.6 to 2.9.1.
- [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/v2.7.6...v2.9.1)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

package.json

@@ -36,7 +36,7 @@
     "prettier": "2.0.5",
     "prop-types": "^15.7.2",
     "react": "^16.13.1",
-    "rollup": "^2.7.6",
+    "rollup": "^2.9.1",
     "rollup-plugin-babel": "^4.4.0",
     "rollup-plugin-bundle-size": "^1.0.3",
     "rollup-plugin-commonjs": "^10.1.0",