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

• [x] I have read the contributing guide and understand what's expected of me
• [x] I have run this code in development and it appears to resolve the stated issue
• [x] This PR includes tests, or tests are not required/relevant for this PR
• [x] 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[bot]]

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: https://github.com/dbt-labs/dbt-snowflake/blob/2cdcf2b7a4c8bba2ab9fcc6ca485dc381eadb05b/.github/scripts/integration-test-matrix.js#L3 https://github.com/dbt-labs/dbt-snowflake/blob/2cdcf2b7a4c8bba2ab9fcc6ca485dc381eadb05b/tox.ini#L3 https://github.com/dbt-labs/dbt-snowflake/blob/2cdcf2b7a4c8bba2ab9fcc6ca485dc381eadb05b/tox.ini#L5 https://github.com/dbt-labs/dbt-snowflake/blob/2cdcf2b7a4c8bba2ab9fcc6ca485dc381eadb05b/tox.ini#L16 https://github.com/dbt-labs/dbt-snowflake/blob/2cdcf2b7a4c8bba2ab9fcc6ca485dc381eadb05b/.pre-commit-config.yaml#L25-L31