Bump ex_machina from 2.2.2 to 2.3.0
Bump ex_machina from 2.2.2 to 2.3.0

Bumps [ex_machina](https://github.com/thoughtbot/ex_machina) from 2.2.2 to 2.3.0.
- [Release notes](https://github.com/thoughtbot/ex_machina/releases)
- [Changelog](https://github.com/thoughtbot/ex_machina/blob/master/CHANGELOG.md)
- [Commits](https://github.com/thoughtbot/ex_machina/compare/v2.2.2...v2.3.0)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
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