Upgrade Catalog to use CKAN 2.10.6

## User Story

Upgrade Catalog to use CKAN 2.10.6

## Acceptance Criteria

[ACs should be clearly demoable/verifiable whenever possible. Try specifying them using [BDD](https://en.wikipedia.org/wiki/Behavior-driven_development#Behavioral_specifications).]

- [x] Catalog [CKAN status](https://catalog.data.gov/api/action/status_show) shows `ckan_version: "2.10.6"`
- [x] Finished harvest jobs.
- [x] QA done, focusing on changes from the [changelog](https://docs.ckan.org/en/2.10/changelog.html#v-2-10-6-2024-12-11).
- [x] Catalog [requirement.in](https://github.com/GSA/catalog.data.gov/blob/main/ckan/requirements.in) file is updated with ckan upstream.

## Sketch

[Notes or a checklist reflecting our understanding of the selected approach]