Upgrade python3 3.12.9 → 3.13.13 (3.12 stream active support ended 2025-04)

[acortelyou]

Is your feature request related to a problem? Please describe.

python3 (in SPECS/python3/python3.spec) is at 3.12.9 on the 3.12 release stream.

• 🟠 Active support for 3.12 ended 2025-04-02.
• Extended support for 3.12 ends 2028-10-31.
• Newer upstream releases: 2
• Latest upstream release: 3.14.4 (stream 3.14)
• Reference: https://endoflife.date/python (checked 2026-04-22)

Describe the solution you'd like

Upgrade python3 to 3.13.13.

Describe alternatives you've considered

• Stay on 3.12, backport upstream security fixes (support ends 2028-10-31).

Additional context

Newer upstream releases:

Stream	LTS?	Latest release	Status	Active support ends	EOL
3.13		3.13.13	🟢 supported	2026-10-01	2029-10-31
3.14		3.14.4	🟢 supported	2027-10-01	2030-10-31