Bump graphql from 1.12.14 to 2.0.16

Bumps [graphql](https://github.com/rmosolgo/graphql-ruby) from 1.12.14 to 2.0.16.
- [Release notes](https://github.com/rmosolgo/graphql-ruby/releases)
- [Changelog](https://github.com/rmosolgo/graphql-ruby/blob/master/CHANGELOG.md)
- [Commits](rmosolgo/graphql-ruby@v1.12.14...v2.0.16)

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

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

Gemfile.lock

@@ -250,7 +250,7 @@ GEM
     github-markup (4.0.1)
     globalid (1.0.0)
       activesupport (>= 5.0)
-    graphql (1.12.14)
+    graphql (2.0.16)
     graphql-batch (0.5.1)
       graphql (>= 1.10, < 3)
       promise.rb (~> 0.7.2)