Update connection_pool requirement from ~> 2.2 to >= 2.2, < 4.0

Updates the requirements on [connection_pool](https://github.com/mperham/connection_pool) to permit the latest version.
- [Changelog](https://github.com/mperham/connection_pool/blob/main/Changes.md)
- [Commits](mperham/connection_pool@v2.5.5...v3.0.2)

---
updated-dependencies:
- dependency-name: connection_pool
  dependency-version: 3.0.2
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

Gemfile.lock

@@ -2,7 +2,7 @@ PATH
   remote: .
   specs:
     minfraud (2.9.0)
-      connection_pool (~> 2.2)
+      connection_pool (>= 2.2, < 4.0)
       http (>= 4.3, < 6.0)
       maxmind-geoip2 (~> 1.4)
       simpleidn (~> 0.1, >= 0.1.1)
@@ -14,7 +14,7 @@ GEM
       public_suffix (>= 2.0.2, < 8.0)
     ast (2.4.3)
     bigdecimal (3.3.1)
-    connection_pool (2.5.5)
+    connection_pool (3.0.2)
     crack (1.0.1)
       bigdecimal
       rexml
@@ -50,8 +50,8 @@ GEM
       ffi-compiler (~> 1.0)
       rake (~> 13.0)
     maxmind-db (1.4.0)
-    maxmind-geoip2 (1.4.0)
-      connection_pool (~> 2.2)
+    maxmind-geoip2 (1.5.1)
+      connection_pool (>= 2.2, < 4.0)
       http (>= 4.3, < 6.0)
       maxmind-db (~> 1.4)
     parallel (1.27.0)

minfraud.gemspec

@@ -27,7 +27,7 @@ Gem::Specification.new do |spec|
   spec.files = Dir['**/*'].difference(Dir['CLAUDE.md', 'CODE_OF_CONDUCT.md', 'dev-bin/**/*', 'Gemfile*', 'Rakefile', 'README.dev.md',
                                           'spec/**/*', '*.gemspec'])
 
-  spec.add_dependency 'connection_pool', '~> 2.2'
+  spec.add_dependency 'connection_pool', '>= 2.2', '< 4.0'
   spec.add_dependency 'http', '>= 4.3', '< 6.0'
   spec.add_dependency 'maxmind-geoip2', '~> 1.4'
   spec.add_dependency 'simpleidn', '~> 0.1', '>= 0.1.1'