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-OPENSSL-7886317

Dockerfile

@@ -1,4 +1,4 @@
-FROM python:3.13.0b2-slim
+FROM python:3.13.0rc2-slim
 
 RUN apt-get update && \
     apt-get install -y --no-install-recommends ca-certificates && \