Bump oj from 3.13.16 to 3.13.19

Bumps [oj](https://github.com/ohler55/oj) from 3.13.16 to 3.13.19.
- [Release notes](https://github.com/ohler55/oj/releases)
- [Changelog](https://github.com/ohler55/oj/blob/develop/CHANGELOG.md)
- [Commits](https://github.com/ohler55/oj/compare/v3.13.16...v3.13.19)

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

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

Gemfile.lock

@@ -665,7 +665,7 @@ GEM
     octokit (4.25.1)
       faraday (>= 1, < 3)
       sawyer (~> 0.9)
-    oj (3.13.16)
+    oj (3.13.19)
     okcomputer (1.18.4)
     omniauth-saml (1.10.3)
       omniauth (~> 1.3, >= 1.3.2)