Maintenance: UserAgent integration test fails because previously non but now existing host URL 'existing.host'.

test/integration/user_agent_test.rb

@@ -405,7 +405,7 @@ class UserAgentTest < ActiveSupport::TestCase
 
     # get / 0
     result = UserAgent.request(
-      'http://not.existing.host/test.php',
+      'http://not.existing.host.tld/test.php',
     )
     assert(result)
     assert_equal(false, result.success?)
@@ -414,7 +414,7 @@ class UserAgentTest < ActiveSupport::TestCase
 
     # ftp / 0
     result = UserAgent.request(
-      'ftp://not.existing.host/test.bin',
+      'ftp://not.existing.host.tld/test.bin',
     )
     assert(result)
     assert_equal(false, result.success?)