fix: Dockerfile to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-DEBIAN11-AOM-1290331
- https://snyk.io/vuln/SNYK-DEBIAN11-AOM-1298721
- https://snyk.io/vuln/SNYK-DEBIAN11-AOM-1300249
- https://snyk.io/vuln/SNYK-DEBIAN11-CURL-3320493
- https://snyk.io/vuln/SNYK-DEBIAN11-CURL-3320493

Dockerfile

@@ -1,4 +1,4 @@
-FROM python:3.11
+FROM python:3.12.0b1-slim
 
 RUN apt-get update \
  && apt-get install -y --no-install-recommends ffmpeg \