Update dbt dependencies

PR Overview

This PR will address the following Issue/Feature: https://github.com/fivetran/dbt_zendesk/issues/109

This PR will result in the following new package version: v0.12.0

Will require a full refresh to update the logic coming from dbt-date

Please detail what change(s) this PR introduces and any additional information that should be known during the review of this PR:

Updates the dbt-date dependency version to the most current

Please acknowledge that you have successfully performed the following commands locally:

Before marking this PR as "ready for review" the following have been applied:

Please acknowledge that the following validation checks have been performed prior to marking this PR as "ready for review":

[x] You have validated these changes and assure this PR will address the respective Issue/Feature.
[x] You are reasonably confident these changes will not impact any other components of this package or any dependent packages.
[x] You have provided details below around the validation steps performed to gain confidence in these changes.

Run with a full refresh

Please acknowledge that your PR contains the following standard updates:

Package versioning has been appropriately indexed in the following locations:
- [x] indexed within dbt_project.yml
- [x] indexed within integration_tests/dbt_project.yml
[x] CHANGELOG has individual entries for each respective change in this PR
[x] README updates have been applied (if applicable)
[ n/a] DECISIONLOG updates have been updated (if applicable)
[ ] Appropriate yml documentation has been added (if applicable)

Please acknowledge that after the above were all completed the below were applied to your branch:

[x] docs were regenerated (unless this PR does not include any code or yml updates)

:dancer: