Bump oj from 3.16.10 to 3.17.3 in /demo (#4104)

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