chore: Bump up supported python versions (drop 3.8; Add 3.13)

[schloerke]

From https://devguide.python.org/versions/

Branch	Schedule	Status	First release	End of life	Release manager
main	PEP 745	feature	2025-10-01	2030-10	Hugo van Kemenade
3.13	PEP 719	prerelease	2024-10-01	2029-10	Thomas Wouters
3.12	PEP 693	bugfix	2023-10-02	2028-10	Thomas Wouters
3.11	PEP 664	security	2022-10-24	2027-10	Pablo Galindo Salgado
3.10	PEP 619	security	2021-10-04	2026-10	Pablo Galindo Salgado
3.9	PEP 596	security	2020-10-05	2025-10	Łukasz Langa
3.8	PEP 569	security	2019-10-14	2024-10	Łukasz Langa

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Related internal code PR #1238