Remove support for Python 3.8

[mikealfare]

Short description

Python 3.8 is officially EOL (as of 10-07-2024). We have already run into an issue where something broke on scheduled testing because a dependency no longer supports Python 3.8. Also, dbt-core has removed support for Python 3.8, both on main and for all older versions. We should update our CI workflows to no longer test against Python 3.8 and update our supported versions on PyPI to no longer list Python 3.8 (since we will not be testing against it).

PRs

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1. [Backport 1.8.latest] Drop support for Python 3.8 dbt-snowflake#1216
   cla:yes +1
   
2. [Backport 1.7.latest] Drop support for Python 3.8 dbt-snowflake#1218
   cla:yes +1
   
3. [Backport 1.6.latest] Drop support for Python 3.8 dbt-snowflake#1219
   cla:yes +1
   
4. [Backport 1.5.latest] Drop support for Python 3.8 dbt-snowflake#1220
   cla:yes +1
   
5. [Backport 1.4.latest] Drop support for Python 3.8 dbt-snowflake#1221
   cla:yes +1
   
6. [Backport 1.8.latest] Drop support for Python 3.8 dbt-bigquery#1379
   cla:yes +1
   
7. [Backport 1.7.latest] Drop support for Python 3.8 dbt-bigquery#1381
   cla:yes +1
   
8. [Backport 1.6.latest] Drop support for Python 3.8 dbt-bigquery#1382
   cla:yes +1
   
9. [Backport 1.5.latest] Drop support for Python 3.8 dbt-bigquery#1383
   cla:yes +1
   
10. [Backport 1.4.latest] Drop support for Python 3.8 dbt-bigquery#1384
    cla:yes +1
    
11. [Backport 1.8.latest] Drop support for Python 3.8 dbt-redshift#932
    cla:yes +1
    
12. [Backport 1.7.latest] Drop support for Python 3.8 dbt-redshift#933
    cla:yes +1
    
13. [Backport 1.6.latest] Drop support for Python 3.8 dbt-redshift#934
    cla:yes +1
    
14. [Backport 1.5.latest] Drop support for Python 3.8 dbt-redshift#935
    cla:yes +1
    
15. [Backport 1.4.latest] Drop support for Python 3.8 dbt-redshift#936
    cla:yes +1
    
16. [Backport 1.8.latest] Drop support for Python 3.8 dbt-spark#1124
    cla:yes +1
    
17. [Backport 1.7.latest] Drop support for Python 3.8 dbt-spark#1125
    cla:yes +1
    
18. [Backport 1.6.latest] Drop support for Python 3.8 dbt-spark#1126
    cla:yes +1
    
19. [Backport 1.5.latest] Drop support for Python 3.8 dbt-spark#1127
    cla:yes +1
    
20. [Backport 1.4.latest] Drop support for Python 3.8 dbt-spark#1128
    cla:yes +1
    

Acceptance criteria

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1. We don't test against Python 3.8 in any GHA workflow
2. We test against all versions of Python that we say are supported on PyPI
3. Where we only test against a single version of Python, that version is the oldest supported version (generally 3.9)

Testing

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1. A full CI run is sufficient for testing this as the updates are all CI related

Security

N/A

Docs

We should remove Python 3.8 support from all of our docs. Updating this repo will remove it from places like PyPI or READMEs. But we might also list this on docs.getdbt.com.

Consequences

This effectively locks all feature development for 3.8 as newer patch versions on PyPI will not be available to pip. Adapters could implement new features themselves, but they would not be able to pick up new features from dbt-adapters, or a concrete adapter that they subclass (e.g. dbt-databricks uses dbt-spark). As 3.8 is EOL, this is considered low risk.

[FishtownBuildBot]

Opened a new issue in dbt-labs/docs.getdbt.com: dbt-labs/docs.getdbt.com#6333