chore(deps): update mcr.microsoft.com/vscode/devcontainers/python docker tag to v3.13 (#294)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.devcontainer/Dockerfile

@@ -1,7 +1,7 @@
 # See here for image contents: https://github.com/microsoft/vscode-dev-containers/tree/v0.191.1/containers/python-3/.devcontainer/base.Dockerfile
 
 # [Choice] Python version
-ARG VARIANT="3.12"
+ARG VARIANT="3.13"
 FROM mcr.microsoft.com/vscode/devcontainers/python:${VARIANT}
 
 # [Choice] Node.js version: none, lts/*, 16, 14, 12, 10