build(deps): bump python in /Resources/docker/app

Bumps python from 3.12.8-alpine3.21 to 3.13.5-alpine3.21.

---
updated-dependencies:
- dependency-name: python
  dependency-version: 3.13.5-alpine3.21
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

Resources/docker/app/Dockerfile

@@ -1,4 +1,4 @@
-FROM python:3.12.8-alpine3.21 AS builder
+FROM python:3.13.5-alpine3.21 AS builder
 
 ENV PYTHONUNBUFFERED=1
 
@@ -11,7 +11,7 @@ RUN apk add --no-cache --virtual .build-deps gcc g++ musl-dev \
     postgresql-dev binutils rust cargo && \
     python3 -m pip install -r requirements.txt --no-cache-dir
 
-FROM python:3.12.8-alpine3.21
+FROM python:3.13.5-alpine3.21
 
 ENV PYTHONUNBUFFERED=1
 ENV DJANGO_SETTINGS_MODULE='config.docker-compose'