fix: Dockerfile to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-DEBIAN12-EXPAT-7855502
- https://snyk.io/vuln/SNYK-DEBIAN12-EXPAT-7855503
- https://snyk.io/vuln/SNYK-DEBIAN12-EXPAT-7855507
- https://snyk.io/vuln/SNYK-DEBIAN12-ZLIB-6008963
- https://snyk.io/vuln/SNYK-DEBIAN12-UTILLINUX-2401083

Dockerfile

@@ -1,4 +1,4 @@
-FROM python:3.9-slim as base
+FROM python:3.13.0rc2-slim as base
 
 ENV \
     # Keeps Python from generating .pyc files in the container