Bump rollup from 2.50.0 to 2.51.0 (#625)

Bumps [rollup](https://github.com/rollup/rollup) from 2.50.0 to 2.51.0.
- [Release notes](https://github.com/rollup/rollup/releases)
- [Changelog](https://github.com/rollup/rollup/blob/master/CHANGELOG.md)
- [Commits](rollup/rollup@v2.50.0...v2.51.0)

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Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

Author: dependabot-preview[bot]

package-lock.json

@@ -44,7 +44,7 @@
     "postcss": "8.3.0",
     "postcss-cli": "^8.3.1",
     "renderless-svelte": "^1.7.0",
-    "rollup": "^2.50.0",
+    "rollup": "^2.51.0",
     "rollup-plugin-babel": "^4.4.0",
     "rollup-plugin-svelte": "^7.1.0",
     "rollup-plugin-terser": "^7.0.2",