squash: user newer AR versions

Author: arielvalentin

instrumentation/pg/Gemfile

@@ -9,7 +9,7 @@ source 'https://rubygems.org'
 gemspec
 
 group :test do
-  gem 'activerecord'
+  gem 'activerecord', '>= 7.0.0'
   gem 'opentelemetry-instrumentation-base', path: '../base'
   gem 'opentelemetry-helpers-sql-obfuscation', path: '../../helpers/sql-obfuscation'
 end