Require maxmind-geoip2 1.6 for residential data

The maxmind-geoip2 gem's AnonymizerFeed/residential support was
released in 1.6.0. Bump the dependency constraint so consumers
resolve a version that includes it.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Author: oschwald

Gemfile.lock

@@ -4,7 +4,7 @@ PATH
     minfraud (2.9.0)
       connection_pool (>= 2.2, < 4.0)
       http (>= 4.3, < 6.0)
-      maxmind-geoip2 (~> 1.4)
+      maxmind-geoip2 (~> 1.6)
       simpleidn (~> 0.1, >= 0.1.1)
 
 GEM
@@ -53,9 +53,9 @@ GEM
       ffi-compiler (~> 1.0)
       rake (~> 13.0)
     maxmind-db (1.4.0)
-    maxmind-geoip2 (1.5.1)
+    maxmind-geoip2 (1.6.0)
       connection_pool (>= 2.2, < 4.0)
-      http (>= 4.3, < 6.0)
+      http (>= 4.3, < 7.0)
       maxmind-db (~> 1.4)
     parallel (1.28.0)
     parser (3.3.11.1)

minfraud.gemspec

@@ -31,7 +31,7 @@ Gem::Specification.new do |spec|
 
   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 'maxmind-geoip2', '~> 1.6'
   spec.add_dependency 'simpleidn', '~> 0.1', '>= 0.1.1'
 
   spec.add_development_dependency 'bundler', '~> 2.2'