Bump graphiql-rails from 1.5.0 to 1.8.0

Bumps [graphiql-rails](https://github.com/rmosolgo/graphiql-rails) from 1.5.0 to 1.8.0.
- [Release notes](https://github.com/rmosolgo/graphiql-rails/releases)
- [Changelog](https://github.com/rmosolgo/graphiql-rails/blob/master/changelog.md)
- [Commits](rmosolgo/graphiql-rails@v1.5.0...v1.8.0)

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

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

Gemfile.lock

@@ -120,7 +120,7 @@ GEM
       rack-protection (>= 1.5.3, < 2.1.0)
     globalid (1.0.0)
       activesupport (>= 5.0)
-    graphiql-rails (1.5.0)
+    graphiql-rails (1.8.0)
       railties
       sprockets-rails
     graphql (1.9.9)