Fix namespace of cross-db macros from dbt_utils to dbt

[stumelius]

Are you a current Fivetran customer?

What change(s) does this PR introduce?

Since dbt_utils 1.0.0 the cross-db macros are in the dbt namespace https://github.com/dbt-labs/dbt-utils/releases/tag/1.0.0.

Did you update the CHANGELOG?

• [ ] Yes

Does this PR introduce a breaking change?

• [ ] Yes (please provide breaking change details below.)
• [ ] No (please provide an explanation as to how the change is non-breaking below.)

Did you update the dbt_project.yml files with the version upgrade (please leverage standard semantic versioning)? (In both your main project and integration_tests)

• [ ] Yes

Is this PR in response to a previously created Bug or Feature Request

• [ ] Yes, Issue/Feature [link bug/feature number here]
• [ ] No

How did you test the PR changes?

• [ ] Buildkite
• [ ] Local (please provide additional testing details below)

Select which warehouse(s) were used to test the PR

• [ ] BigQuery
• [ ] Redshift
• [ ] Snowflake
• [ ] Postgres
• [ ] Databricks
• [ ] Other (provide details below)

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:dancer: **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.

[erika-e]

Oh man I came here to make this PR and Simo beat me to it! 😁 Commenting to follow along since this is blocking our upgrade to the latest versions of everything.

[fivetran-joemarkiewicz]

Thanks for the note @erika-e and raising that this is blocking other users. As that is the case, I may elect to make the required changes directly in order to prioritize getting this fix out the door.

[stumelius]

@fivetran-joemarkiewicz Thanks for taking care of this! I was out for a long weekend so it's good that you went ahead and did the update :)