Start testing on 3.13 beta build

[nateprewitt]

This PR will start provisional testing on the recently released beta for Python 3.13. This will be used to catch any issues early before the official release in October.

[nateprewitt]

We have one set of tests failing for the Cloudformation ArtifactExporter. It's expecting an absolute path for a parent directory but the value in 3.13 is currently \. It likely should be a fully qualified drive (i.e. C:\) to represent the top-level but we'll need to see what the value is on 3.12. This appears to only impact Windows tests.

Failing Tests

FAILED unit\customizations\cloudformation\test_artifact_exporter.py::TestArtifactExporter::test_template_export - ValueError: parent_dir parameter must be an absolute path to a folder \
FAILED unit\customizations\cloudformation\test_artifact_exporter.py::TestArtifactExporter::test_template_export_foreach_invalid - ValueError: parent_dir parameter must be an absolute path to a folder \
FAILED unit\customizations\cloudformation\test_artifact_exporter.py::TestArtifactExporter::test_template_export_foreach_valid - ValueError: parent_dir parameter must be an absolute path to a folder \
FAILED unit\customizations\cloudformation\test_artifact_exporter.py::TestArtifactExporter::test_template_export_metadata - ValueError: parent_dir parameter must be an absolute path to a folder \
FAILED unit\customizations\cloudformation\test_artifact_exporter.py::TestArtifactExporter::test_template_global_export - ValueError: parent_dir parameter must be an absolute path to a folder \

Example Stacktrace

unit\customizations\cloudformation\test_artifact_exporter.py:1217: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

self = <awscli.customizations.cloudformation.artifact_exporter.Template object at 0x0000028BA010EE70>
template_path = '\\foo\\bar\\path', parent_dir = '\\'
uploader = <Mock id='2798709857248'>
resources_to_export = {'resource_type1': <Mock id='2798709858592'>, 'resource_type2': <Mock id='2798709859264'>}
metadata_to_export = [<class 'awscli.customizations.cloudformation.artifact_exporter.ServerlessRepoApplicationReadme'>, <class 'awscli.customizations.cloudformation.artifact_exporter.ServerlessRepoApplicationLicense'>]

    def __init__(self, template_path, parent_dir, uploader,
                 resources_to_export=RESOURCES_EXPORT_LIST,
                 metadata_to_export=METADATA_EXPORT_LIST):
        """
        Reads the template and makes it ready for export
        """
    
        if not (is_local_folder(parent_dir) and os.path.isabs(parent_dir)):
>           raise ValueError("parent_dir parameter must be "
                             "an absolute path to a folder {0}"
                             .format(parent_dir))
E           ValueError: parent_dir parameter must be an absolute path to a folder \