Bump graphql from 2.0.5 to 2.0.6 (#183)

Bumps [graphql](https://github.com/rmosolgo/graphql-ruby) from 2.0.5 to 2.0.6.
- [Release notes](https://github.com/rmosolgo/graphql-ruby/releases)
- [Changelog](https://github.com/rmosolgo/graphql-ruby/blob/master/CHANGELOG.md)
- [Commits](rmosolgo/graphql-ruby@v2.0.5...v2.0.6)

---
updated-dependencies:
- dependency-name: graphql
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Gemfile.lock

@@ -5,7 +5,7 @@ GEM
     bootsnap (1.11.1)
       msgpack (~> 1.2)
     fixture_dependencies (1.10.0)
-    graphql (2.0.5)
+    graphql (2.0.6)
     mocha (1.13.0)
     msgpack (1.4.5)
     nio4r (2.5.8)