Deprecate Python 3.8

[peterallenwebb]

Description

Checklist

• I have read the contributing guide and understand what's expected of me
• I have signed the CLA
• I have run this code in development and it appears to resolve the stated issue
• I have opened an issue to add/update docs, or docs changes are not required/relevant for this PR
• I have run changie new to create a changelog entry

[github-actions]

Thank you for your pull request! We could not find a changelog entry for this change. For details on how to document a change, see the contributing guide.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 68.48%. Comparing base (1bad6b7) to head (821aa90).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #212   +/-   ##
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  Coverage   68.48%   68.48%           
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  Files          52       52           
  Lines        3389     3389           
=======================================
  Hits         2321     2321           
  Misses       1068     1068           

Flag	Coverage Δ
unit	68.48% <ø> (ø)

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[emmyoop]

🪓
Looks good - just a comment around the changelog wording.

[emmyoop]

By updating the pyproject.toml, won't it also prevent you from installing with python 3.8? So really we're fully dropping support for python 3.8, not just in testing?

[peterallenwebb]

I think it's the best call. We've dropped it in dbt-core and dbt-adapters already, so I can't see much reason to retain it here.