build(deps): bump library/python in /docker/unstable (#2185)

Bumps library/python from `555dcc9` to `8f39972`.

---
updated-dependencies:
- dependency-name: library/python
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

docker/unstable/Dockerfile

@@ -1,4 +1,4 @@
-FROM docker.io/library/python:3.11.1-slim@sha256:555dcc94587b4101de48664b45b19f17e099a3ab236dec629791f366e2f2e83c
+FROM docker.io/library/python:3.11.1-slim@sha256:8f3997244336ad0f067ad693f85906263a21a7f571b6577a64134aba889bc95e
 
 COPY docker/unstable/requirements.txt /var/tmp/build/