Update mcr.microsoft.com/devcontainers/python Docker tag to v3.13

.devcontainer/backend/docker-compose.yml

@@ -1,6 +1,6 @@
 services:
   app:
-    image: mcr.microsoft.com/devcontainers/python:3.12-bookworm
+    image: mcr.microsoft.com/devcontainers/python:3.13-bookworm
     volumes:
       - ../..:/simple-ocpp-cs:cached
     command: sleep infinity

Dockerfile

@@ -1,5 +1,5 @@
 # `python-base` sets up all our shared environment variables
-FROM python:3.12-slim AS python-base
+FROM python:3.13-slim AS python-base
 
     # python
 ENV PYTHONUNBUFFERED=1 \

renovate.json

@@ -0,0 +1,3 @@
+{
+  "$schema": "https://docs.renovatebot.com/renovate-schema.json"
+}