Relax sqlite3 version requirement

Rails 8 requires sqlite3 >= 2.1. Allowing >= 1.3 lets Bundler pick
a compatible version for each Rails version.

Author: tf

activeadmin-searchable_select.gemspec

@@ -22,7 +22,7 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency 'rspec-rails', '>= 3.6'
   spec.add_development_dependency 'combustion', '~> 1.0'
   spec.add_development_dependency 'database_cleaner-active_record', '~> 2.1'
-  spec.add_development_dependency 'sqlite3', '~> 1.3'
+  spec.add_development_dependency 'sqlite3', '>= 1.3'
 
   spec.add_development_dependency 'capybara', '~> 3.9'
   spec.add_development_dependency 'puma', '~> 5.0'