vantage_budget end_at date has to be "31"

[LeonidLapshin]

Hi, in the example here the end_at date is "2024-01-01", but while terraform apply I got:

vantage_budget.budget["2 budget"]: Creating...
╷
│ Error: Provider produced inconsistent result after apply
│
│ When applying changes to vantage_budget.budget["1 budget"], provider "provider[\"registry.terraform.io/vantage-sh/vantage\"]" produced an
│ unexpected new value: .periods[0].end_at: was cty.StringVal("2024-01-01"), but now cty.StringVal("2024-01-31").
│
│ This is a bug in the provider, which should be reported in the provider's own issue tracker.
╵

2024-01-01 -> 2024-01-31 change fixes the issue