Bump graphql from 2.0.17 to 2.2.12

Bumps [graphql](https://github.com/rmosolgo/graphql-ruby) from 2.0.17 to 2.2.12.
- [Release notes](https://github.com/rmosolgo/graphql-ruby/releases)
- [Changelog](https://github.com/rmosolgo/graphql-ruby/blob/master/CHANGELOG.md)
- [Commits](rmosolgo/graphql-ruby@v2.0.17...v2.2.12)

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

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

Gemfile.lock

@@ -106,6 +106,7 @@ GEM
       faraday_middleware (~> 1.0, >= 1.0.0.rc1)
       net-http-persistent (~> 4.0)
       nokogiri (~> 1, >= 1.10.8)
+    base64 (0.2.0)
     bcrypt (3.1.18)
     brpoplpush-redis_script (0.1.3)
       concurrent-ruby (~> 1.0, >= 1.0.5)
@@ -201,7 +202,8 @@ GEM
     graphiql-rails (1.9.0)
       railties
       sprockets-rails
-    graphql (2.0.17)
+    graphql (2.2.12)
+      base64
     guard (2.18.0)
       formatador (>= 0.2.4)
       listen (>= 2.7, < 4.0)