Upgrade ActiveSupport to v6.1

This can solve Ruby 3 keyword arguments interop
issues.

Signed-off-by: Hiroshi Hatake <[email protected]>

Author: cosmo0920

fluent-plugin-sql.gemspec

@@ -17,8 +17,8 @@ Gem::Specification.new do |gem|
   gem.license = "Apache-2.0"
 
   gem.add_dependency "fluentd", [">= 0.12.17", "< 2"]
-  gem.add_dependency 'activerecord', "~> 5.1"
-  gem.add_dependency 'activerecord-import', "~> 0.7"
+  gem.add_dependency 'activerecord', "~> 6.1"
+  gem.add_dependency 'activerecord-import', "~> 1.0"
   gem.add_development_dependency "rake", ">= 0.9.2"
   gem.add_development_dependency "test-unit", "> 3.1.0"
   gem.add_development_dependency "test-unit-rr"