25603: Adds support for Python 3.14, removes 3.10

[apbassett]

No description provided.

[howso-mario]

Parsed 1/1 changed config files successfully and the Python 3.14/3.10 diff shape looks coherent.
Leaving this as a comment, not approval, because required checks are failing: Build / final-check; Build / build (3.11); ....

[howso-mario]

Requesting changes for stale release automation/docs:

• The build matrix now builds 3.11-3.14, but the release automation that updates downstream .devcontainer files still iterates ("3.10" "3.11" "3.12" "3.13"), so it would keep generating Python 3.10 devcontainers and omit 3.14.
• README.md still includes 3.10 tag examples and says compatibility is 3.10, 3.11, 3.12, and 3.13.

Please update the downstream generation list and docs to match the new supported range.

[apbassett]

Requesting changes for stale release automation/docs:

• The build matrix now builds 3.11-3.14, but the release automation that updates downstream .devcontainer files still iterates ("3.10" "3.11" "3.12" "3.13"), so it would keep generating Python 3.10 devcontainers and omit 3.14.
• README.md still includes 3.10 tag examples and says compatibility is 3.10, 3.11, 3.12, and 3.13.

Please update the downstream generation list and docs to match the new supported range.

Done.

[howso-mario]

Re-reviewed current head after the follow-up reply. The stale release automation/docs concern is fixed: the downstream .devcontainer generation list now covers 3.11/3.12/3.13/3.14, and README examples/support text no longer list 3.10. Approving the updated head.