Relax rails dependency version requirement

Author: benedikt

active_model-relation.gemspec

@@ -31,7 +31,7 @@ Gem::Specification.new do |spec|
   spec.executables = spec.files.grep(%r{\Aexe/}) { |f| File.basename(f) }
   spec.require_paths = ['lib']
 
-  spec.add_dependency 'activemodel', '>= 7.2', '< 8.1'
+  spec.add_dependency 'activemodel', '>= 7.2'
 
   spec.metadata['rubygems_mfa_required'] = 'true'
 end