Bump oj from 3.16.10 to 3.17.3 in /demo

Bumps [oj](https://github.com/ohler55/oj) from 3.16.10 to 3.17.3.
- [Release notes](https://github.com/ohler55/oj/releases)
- [Changelog](https://github.com/ohler55/oj/blob/develop/CHANGELOG.md)
- [Commits](ohler55/oj@v3.16.10...v3.17.3)

---
updated-dependencies:
- dependency-name: oj
  dependency-version: 3.17.3
  dependency-type: indirect
...

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

Author: dependabot[bot]

demo/Gemfile.lock

@@ -253,11 +253,11 @@ GEM
     nokogiri (1.19.4-x86_64-linux-gnu)
       racc (~> 1.4)
     octicons (19.28.0)
-    oj (3.16.10)
+    oj (3.17.3)
       bigdecimal (>= 3.0)
       ostruct (>= 0.2)
     os (1.1.4)
-    ostruct (0.6.1)
+    ostruct (0.6.3)
     pp (0.6.3)
       prettyprint
     prettyprint (0.2.0)