current_date changed to dbt_utils.current_timestamp_in_utc

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Fivetran created PR

What change(s) does this PR introduce?

This PR introduces the use of the dbt_utils.current_timestamp_in_utc macro in place of the current_date warehouse function within the int_jira__issue_calendar_spine model. This is due to issues some users were experiencing with the package not providing accurate date timestamps in certain regions.

As Fivetran syncs the data in UTC it makes sense to use the UTC timezone in the calendar spine as well.

Does this PR introduce a breaking change?

[X] Yes (please provide breaking change details below.)
[ ] No (please provide explanation how the change is non breaking below.)

This will need to result in a breaking change since the update is being made to the int_jira__issue_calendar_spine model which is incremental. As such, a --full-refresh will be needed to be executed by users in order for the change to be appropriately reflected in their output model.s

Is this PR in response to a previously created Issue

[X] Yes, Issue #44
[ ] No

How did you test the PR changes?

- [X] CircleCi - [ ] Other (please provide additional testing details below) **Select which warehouse(s) were used to test the PR** - [X] BigQuery - [X] Redshift - [X] Snowflake - [X] Postgres - [ ] Databricks - [ ] Other (provide details below) **Provide an emoji that best describes your current mood** ⌚ **Feedback** We are so excited you decided to contribute to the Fivetran community dbt package! We continue to work to improve the packages and would greatly appreciate your [feedback](https://www.surveymonkey.com/r/DQ7K7WW) on our existing dbt packages or what you'd like to see next.

fivetran / dbt_jira

current_date changed to dbt_utils.current_timestamp_in_utc #47