squash: update appraisals

Author: arielvalentin

instrumentation/sinatra/Appraisals

@@ -4,16 +4,10 @@
 #
 # SPDX-License-Identifier: Apache-2.0
 
-appraise 'sinatra-4.x' do
-  gem 'sinatra', '~> 4.0'
-end
-
-appraise 'sinatra-3.x' do
-  gem 'sinatra', '~> 3.0'
-end
-
-appraise 'sinatra-2.x' do
-  gem 'sinatra', '~> 2.1'
+%w[4.1 3.0 2.1].each do |version|
+  appraise "sinatra-#{version}" do
+    gem 'sinatra', "~> #{version}"
+  end
 end
 
 appraise 'sinatra-latest' do