Merge pull request #1759 from freeCodeCamp/renovate/rubygems-rack-vulnerability

chore(deps): update dependency rack to v2.2.3.1 [security]

Gemfile.lock

@@ -67,7 +67,7 @@ GEM
       coderay (~> 1.1)
       method_source (~> 1.0)
     racc (1.6.0)
-    rack (2.2.3)
+    rack (2.2.3.1)
     rack-protection (2.0.7)
       rack
     rack-ssl-enforcer (0.2.9)