ns1: fix record creation

[ldez]

Regression on the API client from a breaking change of the NS1 API client: ns1/ns1-go#220

Same problem as ns1/ns1-go#51

unable to generate a certificate for the domains [*.internal.redacted.com internal.redacted.com internal.redacted.com]:
error: one or more domains had a problem:
[*.internal.redacted.com] [*.internal.redacted.com] acme: error presenting token:
ns1: failed to create record [zone: \"internal.redacted.com\", fqdn: \"_acme-challenge.internal.redacted.com.\"]: PUT https://api.nsone.net/v1/zones/internal.redacted.com/_acme-challenge.internal.redacted.com/TXT: 400 Input validation failed (Value None for field '<obj>.tags' is not of type object)
[internal.redacted.com] [internal.redacted.com] acme: error presenting token:
ns1: failed to create record [zone: \"internal.redacted.com\", fqdn: \"_acme-challenge.internal.redacted.com.\"]: PUT https://api.nsone.net/v1/zones/internal.redacted.com/_acme-challenge.internal.redacted.com/TXT: 400 Input validation failed (Value None for field '<obj>.tags' is not of type object)

Related to:

• ACME Challenge Failure Against NS1 with image tag v2.11.0 traefik/traefik#10450
• attempting to create records with 2.7.13 returns 500 ns1/ns1-go#224