All heroku commands on Windows exit with code 1 on success

Hello, I'm on Heroku CLI 7.16.0 using Windows 10 and it seems like _all_ Heroku commands exit with status code 1 even when they succeed using git bash, e.g.:

```bash
$ heroku maintenance:on
Enabling maintenance mode for ⬢ tenants2... done
$ echo $?
1
```

Or:

```bash
$ heroku container:push -R
... stuff happens ...
Your image has been successfully pushed. You can now release it with the
'container:release' command.
$ echo $?
1
```

This might be a more general case of #955. In any case, it makes automating things with the CLI not terribly reliable.