Bump dbt common 1.6

[MichelleArk]

Resolves #8062

Problem

#10414 requires dbt-common 1.6 contracts, so we should bump the min dbt-common version for dbt-core

Solution

update setup.py

Checklist

• I have read the contributing guide and understand what's expected of me.
• I have run this code in development, and it appears to resolve the stated issue.
• This PR includes tests, or tests are not required or relevant for this PR.
• This PR has no interface changes (e.g., macros, CLI, logs, JSON artifacts, config files, adapter interface, etc.) or this PR has already received feedback and approval from Product or DX.
• This PR includes type annotations for new and modified functions.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.83%. Comparing base (cab6dab) to head (111d6d3).

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #10489      +/-   ##
==========================================
- Coverage   88.86%   88.83%   -0.03%     
==========================================
  Files         180      180              
  Lines       22643    22643              
==========================================
- Hits        20121    20115       -6     
- Misses       2522     2528       +6     

Flag	Coverage Δ
integration	86.06% <ø> (-0.16%)	⬇️
unit	62.22% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Components	Coverage Δ
Unit Tests	62.22% <ø> (ø)
Integration Tests	86.06% <ø> (-0.16%)	⬇️

[emmyoop]

👍