fix: expires not cleared in state when token has no expiry

When NetBox returns a token with no expiration, the Read function skipped
the d.Set call entirely, leaving any previous expires value in state.
Explicitly set expires to nil when the API returns no expiration date to
prevent state drift.

Author: MrKeiKun

netbox/resource_netbox_token.go

@@ -135,6 +135,8 @@ func resourceNetboxTokenRead(ctx context.Context, d *schema.ResourceData, m inte
 	d.Set("last_used", token.LastUsed)
 	if token.Expires != nil {
 		d.Set("expires", token.Expires.String())
+	} else {
+		d.Set("expires", nil)
 	}
 	d.Set("allowed_ips", token.AllowedIps)
 	d.Set("write_enabled", token.WriteEnabled)