Add support for latest dbt_utils

[NiallRees]

We currently only support dbt_utils < 0.9.0

https://github.com/dbt-labs/dbt-utils/releases

[juls858]

this is preventing me from installing use dbt deps as it fails with a version error

[jaypeedevlin]

@NiallRees to address this properly probably involves moving the instances of dbt_utils.split_part() to the cross db macros in dbt >=1.2, what do you think about me making this change as part of #188?

Bumping the deps version by itself gives us a bunch of deprecation warnings on that macro that I guess we want to avoid?

[jaypeedevlin]

Alternate idea — now that split_part lives outside of utils, maybe we copy the SK implementation into our project and remove the dependency altogether?

[NiallRees]

No strong opinions @jaypeedevlin happy for you to decide - might as well include in your PR though for sure

[jaypeedevlin]

For posterity I decided to remove the dependency altogether.

[jaypeedevlin]

This is resolved in 188 which should be released in the next week or so.