Add Python 3.12 to list of supported Python versions

[VersusFacit]

resolves #903

Problem

Adding Python 3.12 should pass a series of tests

• pytest tests/unit local
• pytest tests/functional local
• dbt seed && dbt run in a localjaffle shop using plain pip install dbt-snowflake with 3.12 active
• smoke testing run using test-bundle on snowflake against the jaffle-shop-base scenario with 3.12.3 active
• GHA workflow involving integration tests
• release workflow still works

Solution

No code changes beyond GHA workflows and setup.py are needed for this adapter.

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/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

[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 dbt-snowflake contributing guide.

[VersusFacit]

Verified working release job for 3.12 enabled 🎉

https://github.com/dbt-labs/dbt-snowflake/actions/runs/10046736112/job/27766937211

You can also see 3.12 integration tests working on this very PR.

https://github.com/dbt-labs/dbt-snowflake/actions/runs/10046882814/job/27767327557?pr=1144

[mikealfare]

We also need to update these lines:

dbt-snowflake/.github/scripts/integration-test-matrix.js

Line 3 in 2cdcf2b

const supportedPythonVersions = ["3.8", "3.9", "3.10", "3.11"];

dbt-snowflake/tox.ini

Line 3 in 2cdcf2b

envlist = py38,py39,py310,py311

dbt-snowflake/tox.ini

Line 5 in 2cdcf2b

[testenv:{unit,py38,py39,py310,py311,py}]

dbt-snowflake/tox.ini

Line 16 in 2cdcf2b

[testenv:{integration,py38,py39,py310,py311,py}-{snowflake}]

dbt-snowflake/.pre-commit-config.yaml

Lines 25 to 31 in 2cdcf2b

	args:
	- --line-length=99
	- --target-version=py38
	- --target-version=py39
	- --target-version=py310
	- --target-version=py311
	additional_dependencies: [flaky]