Bump gemspec deps

Author: boie0025

activeadmin-mongoid.gemspec

@@ -19,7 +19,7 @@ Gem::Specification.new do |gem|
 
   gem.required_ruby_version = '>= 3.0'
 
-  gem.add_runtime_dependency 'mongoid',     '>= 6.0', '< 8.a'
+  gem.add_runtime_dependency 'mongoid',     '>= 6.0', '< 8.1'
   gem.add_runtime_dependency 'activeadmin', '>= 1.3.0', '<= 2.8.0'
   gem.add_runtime_dependency 'kaminari-mongoid'
   gem.add_runtime_dependency 'jquery-rails'