Bump httparty from 0.14.0 to 0.21.0 in /graphql

Bumps [httparty](https://github.com/jnunemaker/httparty) from 0.14.0 to 0.21.0.
- [Release notes](https://github.com/jnunemaker/httparty/releases)
- [Changelog](https://github.com/jnunemaker/httparty/blob/master/Changelog.md)
- [Commits](jnunemaker/httparty@v0.14.0...v0.21.0)

---
updated-dependencies:
- dependency-name: httparty
  dependency-type: direct:production
...

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

Author: dependabot[bot]

graphql/Gemfile.lock

@@ -1,9 +1,11 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    httparty (0.14.0)
+    httparty (0.21.0)
+      mini_mime (>= 1.0.0)
       multi_xml (>= 0.5.2)
-    multi_xml (0.5.5)
+    mini_mime (1.1.2)
+    multi_xml (0.6.0)
 
 PLATFORMS
   ruby