Remove python 3.8 support

[mbfreder]

Remove python 3.8 support

Which issue(s) does this change fix?

Why is this change necessary?

Python 3.8 is deprecated

How does it address the issue?

What side effects does this change have?

Mandatory Checklist

PRs will only be reviewed after checklist is complete

• Add input/output type hints to new functions/methods
• Write design document if needed (Do I need to write a design document?)
• Write/update unit tests
• Write/update integration tests
• Write/update functional tests if needed
• make pr passes
• make update-reproducible-reqs if dependencies were changed
• Write documentation

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[roger-zhangg]

tests/functional/commands/init/test_interactive_init_flow.py::TestInteractiveFlow::test_unknown_runtime This is consantly failing, seems a valid bug

[valerena]

There's a samcli/lib/build/constants.py file, with a list of deprecated runtimes, where we should add python3.8. And the corresponding tests for that are in tests/unit/lib/build_module/test_app_builder.py

There's also a message in pytest.ini that says that an ignore option (ignore::boto3.exceptions.PythonDeprecationWarning) can be removed after we stop supporting python3.7, so we might want to get rid of that too

[valerena]

It would probably be good to update this to a newer version of python right away (python3.13), because this is the default init template if people have problems downloading the full list of templates.

[mbfreder]

Updated. Thanks