Fix pipe reading hanging indefinitely on Windows (#756)

* 🐛 fix pipe reading hanging indefinitely

* ⏪ re-set bufsize to 0

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Co-authored-by: Mathieu <923463-mathbou@users.noreply.gitlab.com>
Co-authored-by: William Woodruff <william@yossarian.net>

pip_audit/_subprocess.py

@@ -52,9 +52,8 @@ def run(args: Sequence[str], *, log_stdout: bool = False, state: AuditState = Au
     # once `stdout` hits EOF, so we don't have to worry about that blocking.
     while not terminated:
         terminated = process.poll() is not None
-        # NOTE(ww): Buffer size chosen arbitrarily here and below.
-        stdout += process.stdout.read(4096)  # type: ignore
-        stderr += process.stderr.read(4096)  # type: ignore
+        stdout += process.stdout.read()  # type: ignore
+        stderr += process.stderr.read()  # type: ignore
         state.update_state(
             f"Running {pretty_args}",
             stdout.decode(errors="replace") if log_stdout else None,