fix Gemfile

Author: srinjoyray

appengine/flexible/hello_world/Gemfile

@@ -26,5 +26,5 @@ group :test do
   gem "rspec_junit_formatter"
 end
 
-gem "rackup", "~> 2.2"
 gem "puma", "~> 6.6"
+gem "rackup", "~> 2.2"

appengine/standard-hello_world/Gemfile

@@ -25,5 +25,5 @@ group :test do
   gem "rspec_junit_formatter"
 end
 
-gem "rackup", "~> 2.2"
 gem "puma", "~> 6.6"
+gem "rackup", "~> 2.2"

run/helloworld/Gemfile

@@ -12,5 +12,5 @@ group :test do
   gem "rubysl-securerandom"
 end
 
-gem "rackup", "~> 1.0"
 gem "puma", "~> 6.6"
+gem "rackup", "~> 1.0"