Update dependency rackup to v2.2.1

Author: renovate[bot]

Gemfile

@@ -37,7 +37,7 @@ gem 'octokit', '9.2.0'
 gem 'pdd', '0.24.0'
 gem 'rack', '3.1.8'
 gem 'rack-test', '2.1.0'
-gem 'rackup', '2.2.0'
+gem 'rackup', '2.2.1'
 gem 'rake', '13.2.1', require: false
 gem 'rubocop', '1.67.0', require: false
 gem 'rubocop-rspec', '3.2.0', require: false

Gemfile.lock

@@ -146,7 +146,7 @@ GEM
       rack (>= 3.0.0)
     rack-test (2.1.0)
       rack (>= 1.3)
-    rackup (2.2.0)
+    rackup (2.2.1)
       rack (>= 3)
     rainbow (3.1.1)
     rake (13.2.1)
@@ -257,7 +257,7 @@ DEPENDENCIES
   pdd (= 0.24.0)
   rack (= 3.1.8)
   rack-test (= 2.1.0)
-  rackup (= 2.2.0)
+  rackup (= 2.2.1)
   rake (= 13.2.1)
   rubocop (= 1.67.0)
   rubocop-rspec (= 3.2.0)