Bump rack-protection in /api/ruby/rendering-data-as-graphs (#299)

Bumps [rack-protection](https://github.com/sinatra/sinatra) from 1.5.3 to 1.5.5.
- [Release notes](https://github.com/sinatra/sinatra/releases)
- [Changelog](https://github.com/sinatra/sinatra/blob/master/CHANGELOG.md)
- [Commits](https://github.com/sinatra/sinatra/commits)

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

api/ruby/rendering-data-as-graphs/Gemfile.lock

@@ -19,7 +19,7 @@ GEM
       sawyer (~> 0.8.0, >= 0.5.3)
     public_suffix (3.0.0)
     rack (1.6.13)
-    rack-protection (1.5.3)
+    rack-protection (1.5.5)
       rack
     sawyer (0.8.1)
       addressable (>= 2.3.5, < 2.6)