Merge pull request #239 from rspec/dependabot/bundler/rack-3.1.20

Bump rack from 3.1.18 to 3.1.20

Author: JonRowe

Gemfile.lock

@@ -133,7 +133,7 @@ GEM
     parslet (2.0.0)
     public_suffix (6.0.1)
     racc (1.8.1)
-    rack (3.1.18)
+    rack (3.1.20)
     rack-contrib (2.5.0)
       rack (< 4)
     rack-livereload (0.3.17)