fix(deps): update dependency mitol-django-hubspot-api to v2025

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
mitol-django-hubspot-api	2023.12.19 → 2025.12.18

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[renovate]

⚠️ Artifact update problem

Renovate failed to update an artifact related to this branch. You probably do not want to merge this PR as-is.

♻ Renovate will retry this branch, including artifacts, only when one of the following happens:

• any of the package files in this branch needs updating, or
• the branch becomes conflicted, or
• you click the rebase/retry checkbox if found above, or
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The artifact failure details are included below:

File name: poetry.lock

Updating dependencies
Resolving dependencies...


Because mitol-django-hubspot-api (2025.12.18) depends on hubspot-api-client (12.0.0)
 and mitx pro depends on hubspot-api-client (^6.1.0), mitol-django-hubspot-api is forbidden.
So, because mitx pro depends on mitol-django-hubspot-api (2025.12.18), version solving failed.

[asajjad2]

Blocking this based on https://github.com/mitodl/hq/issues/8295#issuecomment-3265357171