Bump graphql from 2.3.14 to 2.3.18

Bumps [graphql](https://github.com/rmosolgo/graphql-ruby) from 2.3.14 to 2.3.18.
- [Release notes](https://github.com/rmosolgo/graphql-ruby/releases)
- [Changelog](https://github.com/rmosolgo/graphql-ruby/blob/master/CHANGELOG.md)
- [Commits](rmosolgo/graphql-ruby@v2.3.14...v2.3.18)

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

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

Gemfile.lock

@@ -227,7 +227,7 @@ GEM
     graphiql-rails (1.8.0)
       railties
       sprockets-rails
-    graphql (2.3.14)
+    graphql (2.3.18)
       base64
       fiber-storage
     groupdate (6.4.0)