Allow S3 tests against buckets in other regions

Only us-east-1 gives URLs like bucket.s3.amazonaws.com whereas other
regions have URLs like s3-eu-west-1.amazonaws.com/ubxd-rails

activestorage/test/controllers/direct_uploads_controller_test.rb

@@ -27,7 +27,7 @@ class ActiveStorage::S3DirectUploadsControllerTest < ActionDispatch::Integration
         assert_equal checksum, details["checksum"]
         assert_equal "text/plain", details["content_type"]
         assert_match SERVICE_CONFIGURATIONS[:s3][:bucket], details["direct_upload"]["url"]
-        assert_match(/s3\.(\S+)?amazonaws\.com/, details["direct_upload"]["url"])
+        assert_match(/s3(-[-a-z0-9]+)?\.(\S+)?amazonaws\.com/, details["direct_upload"]["url"])
         assert_equal({ "Content-Type" => "text/plain", "Content-MD5" => checksum }, details["direct_upload"]["headers"])
       end
     end

activestorage/test/service/s3_service_test.rb

@@ -35,7 +35,7 @@ class ActiveStorage::Service::S3ServiceTest < ActiveSupport::TestCase
       url = @service.url(FIXTURE_KEY, expires_in: 5.minutes,
         disposition: :inline, filename: ActiveStorage::Filename.new("avatar.png"), content_type: "image/png")
 
-      assert_match(/s3\.(\S+)?amazonaws.com.*response-content-disposition=inline.*avatar\.png.*response-content-type=image%2Fpng/, url)
+      assert_match(/s3(-[-a-z0-9]+)?\.(\S+)?amazonaws.com.*response-content-disposition=inline.*avatar\.png.*response-content-type=image%2Fpng/, url)
       assert_match SERVICE_CONFIGURATIONS[:s3][:bucket], url
     end