Fix Windows CLI support

[transitive-bullshit]

Windows support for the saasify CLI seems to be broken.

C:\Code\budgify>saasify dev
parsing config saasify.json
parsing service index.ts
√ Preparing deployment
added 278 packages from 204 contributors and audited 2259 packages in 13.972s
found 0 vulnerabilities

now dev C:\Users\Dioge\AppData\Local\Temp\698c703a8d8382a604208c4df0ba0823
> Now CLI 16.5.2 dev (beta) — https://zeit.co/feedback/dev
- Installing builders: @now/node@1.0.1
> Error! Command failed with exit code 1: C:\Program Files\nodejs\node.exe C:\Users\Dioge\AppData\Local\co.zeit.now\Cache\dev\builders\yarn add --exact --no-lockfile --non-interactive @now/node@1.0.1

Similar with deployments:

C:\Code\budgify>saasify deploy
parsing config saasify.json
parsing service index.ts
× Creating deployment
Request failed with status code 400
Error building deployment

> NOTE: This is the first deployment in the joshuakgoldberg-budgify project. It will be promoted to production.
> NOTE: To deploy to production in the future, run `now --prod`.
- Queued...
- Building...
> Error! Build failed
> Error! Check your logs at https://joshuakgoldberg-budgify-h6k4adk6o.now.sh/_logs or run `now logs https://joshuakgoldberg-budgify-h6k4adk6o.now.sh`

cc @JoshuaKGoldberg