chore: use a local instead of remote file for test

[lukekarrys]

I was able to replicate the same behavior from #332 by piping a readable
stream with a highWaterMark of 1 to extract. I confirmed this test
still failed without the fixes from #332 and now passes.

[webark]

nice! that's good to know.

[lukekarrys]

@webark I learned it while making this PR 😄 You're original PR was very helpful and I was fine to leave it as an https request. But I decided to investigate a little since I'd be getting notifications for a flaky test and stumbled upon this fix.

[wraithgar]

it's probably good to still have a test that makes sure this works with a stream sent directly from http/https. I know nock can return streams.

[lukekarrys]

Force pushed a new commit that adds another test mocked with nock.