Bump dbt to v0.18.0

[clrcrl]

Description & motivation

dbt v0.18.0 release

Checklist

• [ ] I have verified that these changes work locally
• n/a I have updated the README.md (if applicable)
• n/a I have added tests & descriptions to my models (and macros if applicable)

Notes

I noticed that the version: param gets populated in this project — do you want me to update that?

[jtcohen6]

Ah sorry I should have tagged you earlier! I had some of this work already in progress, opened in #97

[clrcrl]

All g!