Bump octicons from 19.28.0 to 19.29.1 in /demo (#4120)

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: LiuLiu <liuliu-dev@github.com>

Author: dependabot[bot]

demo/Gemfile.lock

@@ -252,7 +252,7 @@ GEM
       racc (~> 1.4)
     nokogiri (1.19.4-x86_64-linux-gnu)
       racc (~> 1.4)
-    octicons (19.28.0)
+    octicons (19.29.1)
     oj (3.17.3)
       bigdecimal (>= 3.0)
       ostruct (>= 0.2)