Bump oj from 3.13.19 to 3.13.20 (#413)

Bumps [oj](https://github.com/ohler55/oj) from 3.13.19 to 3.13.20.
- [Release notes](https://github.com/ohler55/oj/releases)
- [Changelog](https://github.com/ohler55/oj/blob/develop/CHANGELOG.md)
- [Commits](ohler55/oj@v3.13.19...v3.13.20)

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

Signed-off-by: dependabot[bot] <[email protected]>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: xmas7

Gemfile.lock

@@ -79,7 +79,7 @@ GEM
     nokogiri (1.13.6)
       mini_portile2 (~> 2.8.0)
       racc (~> 1.4)
-    oj (3.13.19)
+    oj (3.13.20)
     parallel (1.22.1)
     parser (3.1.2.0)
       ast (~> 2.4.1)