Bump oj from 3.13.20 to 3.13.21 (#418)

Bumps [oj](https://github.com/ohler55/oj) from 3.13.20 to 3.13.21.
- [Release notes](https://github.com/ohler55/oj/releases)
- [Changelog](https://github.com/ohler55/oj/blob/develop/CHANGELOG.md)
- [Commits](ohler55/oj@v3.13.20...v3.13.21)

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

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

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

Author: xmas7

Gemfile.lock

@@ -82,7 +82,7 @@ GEM
     nokogiri (1.13.6)
       mini_portile2 (~> 2.8.0)
       racc (~> 1.4)
-    oj (3.13.20)
+    oj (3.13.21)
     parallel (1.22.1)
     parser (3.1.2.1)
       ast (~> 2.4.1)