Bump graphql from 1.9.4 to 1.9.6
Bump graphql from 1.9.4 to 1.9.6

Bumps [graphql](https://github.com/rmosolgo/graphql-ruby) from 1.9.4 to 1.9.6.
- [Release notes](https://github.com/rmosolgo/graphql-ruby/releases)
- [Changelog](https://github.com/rmosolgo/graphql-ruby/blob/master/CHANGELOG.md)
- [Commits](https://github.com/rmosolgo/graphql-ruby/compare/v1.9.4...v1.9.6)
kenchan/tdnm,kenchan/tdnm,kenchan/tdnm,kenchan/tdnm