Bump rollup and react-scripts in /flowauth/frontend

Bumps [rollup](https://github.com/rollup/rollup) to 2.80.0 and updates ancestor dependency [react-scripts](https://github.com/facebook/create-react-app/tree/HEAD/packages/react-scripts). These dependencies need to be updated together.


Updates `rollup` from 1.32.1 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](rollup/rollup@v1.32.1...v2.80.0)

Updates `react-scripts` from 4.0.3 to 5.0.1
- [Release notes](https://github.com/facebook/create-react-app/releases)
- [Changelog](https://github.com/facebook/create-react-app/blob/main/CHANGELOG-4.x.md)
- [Commits](https://github.com/facebook/create-react-app/commits/react-scripts@5.0.1/packages/react-scripts)

---
updated-dependencies:
- dependency-name: rollup
  dependency-version: 2.80.0
  dependency-type: indirect
- dependency-name: react-scripts
  dependency-version: 5.0.1
  dependency-type: direct:production
...

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Author: dependabot[bot]