Fix syntax error on older versions

Author: nobu

test/resolv/test_dns.rb

@@ -525,7 +525,7 @@ def test_no_server
       if RUBY_PLATFORM.match?(/mingw/)
         # cannot repo locally
         omit 'Timeout Error on MinGW CI'
-      elsif macos?([26,1]..)
+      elsif macos?([26,1]..[])
         omit 'Timeout Error on macOS 26.1+'
       else
         raise Timeout::Error