build: bump Python base off stale 3.13.1 patch -> 3.13 line#203
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Pinning the exact python:3.13.1-alpine3.21 patch froze the runtime on a December 2024 CPython build, missing subsequent 3.13 security and bug-fix patch releases. Relax the pin to the 3.13 minor line so rebuilds pick up the latest 3.13 patch automatically. Python 3.13 remains a supported minor line, and app dependencies stay pinned via uv.lock, so reproducibility of the application deps is unaffected.
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Summary
Relax the Docker base image pin from the exact patch
python:3.13.1-alpine3.21to thepython:3.13-alpine3.21minor line.This addresses a security-audit lifecycle finding (CWE-1104, Use of Unmaintained Third Party Components — Low). Python 3.13 itself is still supported (bugfixes through ~2029), but
3.13.1is a December 2024 patch release. Pinning that exact patch froze the runtime on a 2024 build and left it missing ~13 subsequent CPython patch releases of security and bug fixes. Tracking the3.13minor line means rebuilds automatically pick up the latest 3.13 patch, so this drift never recurs while staying on the same supported minor.Scope / verification
Dockerfile(base image tag only); nothing else touched.uv.lock(uv sync --frozen), so build reproducibility of the app deps is unaffected.python:3.13-alpine3.21is a standard Docker official image variant. Confirmed resolvable viadocker manifest inspect python:3.13-alpine3.21(returns a valid multi-arch OCI image index).