Bump atob from 2.0.3 to 2.1.2

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

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

Author: dependabot[bot]