Bump graphql from 1.13.5 to 1.13.8 (#163)

Bumps [graphql](https://github.com/rmosolgo/graphql-ruby) from 1.13.5 to 1.13.8.
- [Release notes](https://github.com/rmosolgo/graphql-ruby/releases)
- [Changelog](https://github.com/rmosolgo/graphql-ruby/blob/master/CHANGELOG.md)
- [Commits](rmosolgo/graphql-ruby@v1.13.5...v1.13.8)

---
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 (1.10.2)
       msgpack (~> 1.2)
     fixture_dependencies (1.10.0)
-    graphql (1.13.7)
+    graphql (1.13.8)
     mocha (1.13.0)
     msgpack (1.4.4)
     nio4r (2.5.8)