Bump rollup from 2.26.11 to 2.28.1

Bumps [rollup](https://github.com/rollup/rollup) from 2.26.11 to 2.28.1.
- [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/v2.26.11...v2.28.1)

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

package-lock.json

@@ -705,9 +705,9 @@
       }
     },
     "rollup": {
-      "version": "2.26.11",
-      "resolved": "https://registry.npmjs.org/rollup/-/rollup-2.26.11.tgz",
-      "integrity": "sha512-xyfxxhsE6hW57xhfL1I+ixH8l2bdoIMaAecdQiWF3N7IgJEMu99JG+daBiSZQjnBpzFxa0/xZm+3pbCdAQehHw==",
+      "version": "2.28.1",
+      "resolved": "https://registry.npmjs.org/rollup/-/rollup-2.28.1.tgz",
+      "integrity": "sha512-DOtVoqOZt3+FjPJWLU8hDIvBjUylc9s6IZvy76XklxzcLvAQLtVAG/bbhsMhcWnYxC0TKKcf1QQ/tg29zeID0Q==",
       "dev": true,
       "requires": {
         "fsevents": "~2.1.2"