fix: docs/samples/v1beta1/transformer/feast/feast_server.Dockerfile t…

…o 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-COREUTILS-1543939
- https://snyk.io/vuln/SNYK-DEBIAN12-COREUTILS-1543947

docs/samples/v1beta1/transformer/feast/feast_server.Dockerfile

@@ -1,4 +1,4 @@
-FROM python:3.9-slim
+FROM python:3.13.0b4-slim
 RUN pip install --upgrade pip && pip install "feast[gcp]~=0.30.0" "feast[redis]~=0.30.0" "feast[aws]~=0.30.0"
 ENV FEAST_USAGE=False
 EXPOSE 6566