Bugfix/timestamp tz fix: don't merge until next dbt_utils release

Are you a current Fivetran customer?

fivetran made PR

What change(s) does this PR introduce?

makes sure the timestamp columns in balance_transactions don't have time zones in redshift and postgres
adjusts package versions and changelog accordingly

Does this PR introduce a breaking change?

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

Is this PR in response to a previously created Issue

[x] Yes, Issue https://github.com/fivetran/dbt_stripe/issues/22
[ ] 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 - [ ] 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_stripe_source

Bugfix/timestamp tz fix: don't merge until next dbt_utils release #34