Bump loofah from 2.25.1 to 2.25.2 in /demo (#4141)

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Author: dependabot[bot]

demo/Gemfile.lock

@@ -210,7 +210,7 @@ GEM
       ffi-compiler (~> 1.0)
       rake (~> 13.0)
     logger (1.7.0)
-    loofah (2.25.1)
+    loofah (2.25.2)
       crass (~> 1.0.2)
       nokogiri (>= 1.12.0)
     lookbook (2.3.14)