Bump oj from 3.13.21 to 3.16.1

Bumps [oj](https://github.com/ohler55/oj) from 3.13.21 to 3.16.1.
- [Changelog](https://github.com/ohler55/oj/blob/develop/CHANGELOG.md)
- [Commits](ohler55/oj@v3.13.21...v3.16.1)

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

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

Gemfile.lock

@@ -245,7 +245,7 @@ GEM
       rack (>= 1.2, < 4)
       snaky_hash (~> 2.0)
       version_gem (~> 1.1)
-    oj (3.13.21)
+    oj (3.16.1)
     omniauth (2.1.1)
       hashie (>= 3.4.6)
       rack (>= 2.2.3)