Bump graphql from 1.7.8 to 1.7.9
Bump graphql from 1.7.8 to 1.7.9

Bumps [graphql](https://github.com/rmosolgo/graphql-ruby) from 1.7.8 to 1.7.9.
- [Changelog](https://github.com/rmosolgo/graphql-ruby/blob/master/CHANGELOG-pro.md)
- [Commits](https://github.com/rmosolgo/graphql-ruby/compare/v1.7.8...v1.7.9)
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