chore(deps): bump rack from 2.2.9 to 2.2.18 in /examples/ruby-api (#657)

Author: arpit-jn

examples/ruby-api/Gemfile.lock

@@ -8,7 +8,7 @@ GEM
     nio4r (2.7.3)
     puma (5.6.9)
       nio4r (~> 2.0)
-    rack (2.2.9)
+    rack (2.2.18)
     rack-protection (2.2.3)
       rack
     ruby2_keywords (0.0.5)