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-APT-1541449
- https://snyk.io/vuln/SNYK-DEBIAN12-APT-1541449
- https://snyk.io/vuln/SNYK-DEBIAN12-KRB5-6277411
- https://snyk.io/vuln/SNYK-DEBIAN12-KRB5-6277412

Author: snyk-bot

Dockerfile

@@ -10,7 +10,7 @@ COPY protect_exporter ./protect_exporter
 COPY poetry.lock pyproject.toml ./
 RUN poetry build -f wheel
 
-FROM python:3.11-slim
+FROM python:3.13.0b4-slim
 WORKDIR /srv
 COPY --from=builder /build/dist/*.whl ./
 RUN pip install *.whl