Bump python from 3.12-slim to 3.14-slim

[dependabot]

Bumps python from 3.12-slim to 3.14-slim.

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[ahmetrende]

Applied in 6364761, together with the CI change it needed. This was green because the container jobs start the app on python:3.14-slim; the test suite still only ran on 3.11 and 3.12, so the image would have shipped on a runtime nothing had tested. The matrix now covers 3.11–3.14, and the suite plus ruff were measured clean inside python:3.14-slim before the bump was taken.

[dependabot]

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