Bump oj from 3.10.15 to 3.10.16

Bumps [oj](https://github.com/ohler55/oj) from 3.10.15 to 3.10.16.
- [Release notes](https://github.com/ohler55/oj/releases)
- [Changelog](https://github.com/ohler55/oj/blob/develop/CHANGELOG.md)
- [Commits](ohler55/oj@v3.10.15...v3.10.16)

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

Gemfile.lock

@@ -16,7 +16,7 @@ GEM
     mime-types (3.3.1)
       mime-types-data (~> 3.2015)
     mime-types-data (3.2020.1104)
-    oj (3.10.15)
+    oj (3.10.16)
     require_all (3.0.0)
     rspec (3.10.0)
       rspec-core (~> 3.10.0)