fix: Dockerfile to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-DEBIAN12-ZLIB-6008963
- https://snyk.io/vuln/SNYK-DEBIAN12-KRB5-1549480
- https://snyk.io/vuln/SNYK-DEBIAN12-KRB5-6277411
- https://snyk.io/vuln/SNYK-DEBIAN12-KRB5-6277412
- https://snyk.io/vuln/SNYK-DEBIAN12-KRB5-6277421

Dockerfile

@@ -1,5 +1,5 @@
 # syntax=docker/dockerfile:1
-FROM python:3.10-slim
+FROM python:3.13.0b4-slim
 MAINTAINER Giuseppe De Marco <demarcog83@gmail.com>
 ENV PYTHONDONTWRITEBYTECODE=1
 ENV PYTHONUNBUFFERED=1