Bump oj from 3.9.0 to 3.9.1

Bumps [oj](https://github.com/ohler55/oj) from 3.9.0 to 3.9.1.
- [Release notes](https://github.com/ohler55/oj/releases)
- [Changelog](https://github.com/ohler55/oj/blob/develop/CHANGELOG.md)
- [Commits](ohler55/oj@v3.9.0...v3.9.1)

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

Gemfile.lock

@@ -187,7 +187,7 @@ GEM
       multi_json (~> 1.3)
       multi_xml (~> 0.5)
       rack (>= 1.2, < 3)
-    oj (3.9.0)
+    oj (3.9.1)
     omniauth (1.9.0)
       hashie (>= 3.4.6, < 3.7.0)
       rack (>= 1.6.2, < 3)