Bump rack from 1.6.11 to 1.6.13 in /script/live_event_display

Bumps [rack](https://github.com/rack/rack) from 1.6.11 to 1.6.13.
- [Release notes](https://github.com/rack/rack/releases)
- [Changelog](https://github.com/rack/rack/blob/master/CHANGELOG.md)
- [Commits](rack/rack@1.6.11...1.6.13)

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

script/live_event_display/Gemfile.lock

@@ -3,7 +3,7 @@ GEM
   specs:
     puma (2.7.1)
       rack (>= 1.1, < 2.0)
-    rack (1.6.11)
+    rack (1.6.13)
     rack-protection (1.5.5)
       rack
     sinatra (1.4.4)