After validating Python 3.13 in the MongoDB codebase, consolidate the v5 toolchain
to use only Python 3.13, removing Python 3.10 (python3-v5) to avoid maintaining
two Python versions.

Current state:

• python3-v5: Python 3.10.4 (existing)
• python313-v5: Python 3.13.11 (newly added)

Proposed final state:

• python3-v5: Python 3.13.11 (replace 3.10 with 3.13)
• Remove python313-v5 product

Tasks:
1. Validate Python 3.13 works with all MongoDB builds and tests
2. Update python3-v5 to build Python 3.13.11 instead of 3.10.4
3. Remove python313-v5 product definition from mciproject.yml
4. Remove python313-v5 from scripts/products.sh
5. Update any documentation/comments referencing python313-v5
6. Remove build-python-v5.sh (consolidate back to build-python-v4.sh or rename appropriately)

Files to update:

• mciproject.yml
• scripts/products.sh
• scripts/build-python-v4.sh or scripts/build-python-v5.sh