Bump python in /release/oci

Bumps python from 3.11-slim-bookworm to 3.12-slim-bookworm.

---
updated-dependencies:
- dependency-name: python
  dependency-type: direct:production
...

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

release/oci/Dockerfile

@@ -4,7 +4,7 @@
 # - https://vsupalov.com/buildkit-cache-mount-dockerfile/
 # - https://github.com/FernandoMiguel/Buildkit#mounttypecache
 
-FROM python:3.11-slim-bookworm
+FROM python:3.12-slim-bookworm
 
 ENV DEBIAN_FRONTEND noninteractive
 ENV TERM linux