HubSpot v4 APIs are deprecated

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See https://developers.hubspot.com/changelog/deprecating-support-for-hubspot-v4-apis

What does this mean for developers?

If your app or integration currently uses v4 APIs (e.g., /crm/v4/), you should plan to migrate to the latest date-based versioned API before March 30, 2027. The current recommended target is API version 2026-03.

To prepare:

• Inventory any applications, integrations, or internal tooling that still call v4 APIs.
• Update those integrations to use a supported date-based API version.
• Validate and roll out the new version before the end-of-support date to avoid disruption.

For Marketplace apps, this also affects certification and recertification. Apps using unsupported API versions that no longer meet the latest requirements may be denied certification or recertification, and non-functional apps may be removed from the HubSpot Marketplace.

Please update the package to use the current recommended API version.