[BUG] Broken get attached public keys endpoint

[dstanek]

Bug Description

The get attached public key endpoint always returns a 404, even for a valid VPS ID. This makes the Terraform provider mostly useless.

There are two related provider issues:

1. failed to fetch SSH keys for VM terraform-provider-hostinger#29
2. Import vps after creation terraform-provider-hostinger#18

Steps to Reproduce

The easiest way to reproduce is to just use the "Test Request" button in the documentation.

Expected Behavior

Returns the public keys attached to the virtual machine.

Actual Behavior

Always returns a 404.