Bump rollup from 2.70.0 to 2.80.0 in /react-express-mysql/frontend

Bumps [rollup](https://github.com/rollup/rollup) from 2.70.0 to 2.80.0.
- [Release notes](https://github.com/rollup/rollup/releases)
- [Changelog](https://github.com/rollup/rollup/blob/v2.80.0/CHANGELOG.md)
- [Commits](https://github.com/rollup/rollup/compare/v2.70.0...v2.80.0)

---
updated-dependencies:
- dependency-name: rollup
  dependency-version: 2.80.0
  dependency-type: indirect
...

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