[Security] Bump atob from 2.0.3 to 2.1.2 in /example
[Security] Bump atob from 2.0.3 to 2.1.2 in /example

Bumps [atob](https://github.com/coolaj86/node-browser-compat) from 2.0.3 to 2.1.2. **This update includes security fixes.**
- [Release notes](https://github.com/coolaj86/node-browser-compat/releases)
- [Commits](https://github.com/coolaj86/node-browser-compat/commits)

Signed-off-by: dependabot-preview[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
n6g7/redux-saga-firebase