Bump paragonie/random_compat from 2.0.12 to 2.0.18

Bumps [paragonie/random_compat](https://github.com/paragonie/random_compat) from 2.0.12 to 2.0.18.
- [Release notes](https://github.com/paragonie/random_compat/releases)
- [Changelog](https://github.com/paragonie/random_compat/blob/master/CHANGELOG.md)
- [Commits](paragonie/random_compat@v2.0.12...v2.0.18)

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

Author: dependabot-support