Bug: `budget_type` can be `BundlePricing`

[jorgevargas-dvt]

The enterprise billing budgets endpoint returns budget_type: "BundlePricing" for AI credit
budgets, but the model only allows two values, so .parsed_data raises.

budget_type: Literal["SkuPricing", "ProductPricing"]   # githubkit model
"budget_type": "BundlePricing"                          # GitHub response

Endpoint: GET /enterprises/{enterprise}/settings/billing/budgets (ghec-2026-03-10).

The request body models already accept BundlePricing; only the response model was left out.

Workaround today is reading .json() instead of .parsed_data, which loses the typing.

• model on master
• GitHub docs

[yanyongyu]

New versions of the schema packages have been released. You can upgrade your dependencies to fix this.