chore(general): remove python 3.8 in CI and add Python 3.13

[harryzcy]

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

Description

• Drop Python 3.8 in CI as it's out of support and removed in docs in docs(general): Update Python versions and add env vars to the docs #6812.
• Add Python 3.13 to CI, following feat(general): initial support for python 3.13 #6962

Checklist:

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added tests that prove my feature, policy, or fix is effective and works
• New and existing tests pass locally with my changes

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Generated description

Below is a concise technical summary of the changes proposed in this PR:

Updates Python version support across the project. Removes Python 3.8 from CI workflows and documentation, adds Python 3.13 to supported versions, and updates deprecated Lambda runtimes. Modifies various configuration files to reflect these changes, including GitHub Actions workflows, setup.py, and Pipfile.

Topic	Details
Runtime Updates	Updates deprecated Lambda runtimes and App Service Python versions Modified files (2) checkov/arm/checks/resource/AppServicePythonVersion.py checkov/terraform/checks/resource/aws/DeprecatedLambdaRuntime.py Latest Contributors(2) User Commit Date RachelBorzi feat-arm-AppServicePyt... June 01, 2024 tsmithv11 docs-general-Remove-Py... April 25, 2024
Python Version Update	Updates Python version support across the project, removing 3.8 and adding 3.13 Modified files (8) .github/workflows/pr-test.yml .github/workflows/coverage.yaml .github/workflows/pipenv-update.yml docs/4.Integrations/GitHub Actions.md setup.py Pipfile .github/workflows/build.yml .github/workflows/nightly.yml Latest Contributors(2) User Commit Date tjwald feat-general-initial-s... January 23, 2025 tsmithv11 chore-general-Add-a-jo... January 22, 2025

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