Merge pull request #12 from iamsimakov/dependabot/bundler/examples/rails_app/rack-2.2.3

Bump rack from 2.0.6 to 2.2.3 in /examples/rails_app

Author: iamsimakov

examples/rails_app/Gemfile.lock

@@ -106,7 +106,7 @@ GEM
       mini_portile2 (~> 2.4.0)
     public_suffix (3.0.3)
     puma (3.12.1)
-    rack (2.0.6)
+    rack (2.2.3)
     rack-test (1.1.0)
       rack (>= 1.0, < 3)
     rails (5.2.2.1)