Bump thor from 1.3.2 to 1.4.0 in /demo (#3594)

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Author: dependabot[bot]

demo/Gemfile.lock

@@ -339,7 +339,7 @@ GEM
     stimulus-rails (1.3.4)
       railties (>= 6.0.0)
     stringio (3.1.7)
-    thor (1.3.2)
+    thor (1.4.0)
     timeliness (0.3.10)
     turbo-rails (2.0.16)
       actionpack (>= 7.1.0)