Replace `github.com/go-resty/resty/v2` with `net/http`

[ckaznocha]

All versions of the resty package are affected by GO-2023-2328 with no available fix.

I'm not familiar with the resty package but I'm sure it could be swapped out for net/http. I'm happy to submit a PR to make the change.

[dabeeeenster]

Thanks for the heads up - a PR would be great!