resolv/test_addr.rb: require tempfile for new test in r44312

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@44321 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
Avoid tempfile leaks using Tempfile.create instead of Tempfile.open.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@46117 b2dd03c8-39d4-4d8f-98ff-823fe69b080e