Pin connection_pool < 3 for Ruby 3.1 compatibility

Author: sudoremo

Gemfile

@@ -7,6 +7,7 @@ gemspec
 gem 'appraisal'
 gem 'bundler'
 gem 'cancancan'
+gem 'connection_pool', '< 3' # 3.x requires Ruby >= 3.2
 gem 'minitest', '~> 5.25'
 gem 'pry'
 gem 'rake'

Gemfile.lock

@@ -102,7 +102,7 @@ GEM
     cancancan (3.5.0)
     coderay (1.1.3)
     concurrent-ruby (1.3.6)
-    connection_pool (3.0.2)
+    connection_pool (2.5.5)
     crass (1.0.6)
     date (3.5.1)
     docile (1.4.0)
@@ -265,6 +265,7 @@ DEPENDENCIES
   appraisal
   bundler
   cancancan
+  connection_pool (< 3)
   minitest (~> 5.25)
   pry
   rails_ops!