Bump rack from 3.1.8 to 3.1.10 in /demo (#3328)

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Author: dependabot[bot]

demo/Gemfile.lock

@@ -260,7 +260,7 @@ GEM
     puma (6.6.0)
       nio4r (~> 2.0)
     racc (1.8.1)
-    rack (3.1.8)
+    rack (3.1.10)
     rack-cors (2.0.2)
       rack (>= 2.0.0)
     rack-proxy (0.7.7)