sysutils/doctl: Update to version 1.48.1
Upstream changes:
https://github.com/digitalocean/doctl/releases/tag/v1.47.0
https://github.com/digitalocean/doctl/releases/tag/v1.48.0
https://github.com/digitalocean/doctl/releases/tag/v1.48.1
Sponsored by: DigitalOcean (VM credit)