fix: resolve std::system_error in adaparse on Windows

[myd7349]

On Windows, the equivalent of /dev/nul is nul. Using /dev/nul on Windows will cause the program to throw a runtime exception when the output parameter is not specified.

[anonrig]

Nice. Is it easy to write a test for this? (So we don't regress)

[myd7349]

Hello. @anonrig Adding a test sounds like a good idea.

To my understanding, this is a modification to adaparse, so should this test be added as a step in CI to execute adaparse and ensure it works(For example, checking whether it correctly parses a URL as expected or ensuring its exit code is 0?)? Or should a post-build event be added in CMake to run the test?

I took a look at the tests under https://github.com/ada-url/ada/tree/main/tests, and they all seem to be testing ada's API. So, I need some guidance.

[anonrig]

I think we need to add a new test file under tests folder that links to adaparse. Let's merge this as it is, and appreciate it if you can add a test for it as a follow up.