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-KRB5-6277421
- https://snyk.io/vuln/SNYK-DEBIAN12-PAM-6178914
- https://snyk.io/vuln/SNYK-DEBIAN12-UTILLINUX-2401083
- https://snyk.io/vuln/SNYK-DEBIAN12-UTILLINUX-2401083

Dockerfile

@@ -1,4 +1,4 @@
-FROM python:3.12-slim
+FROM python:3.13.0rc2-slim
 RUN useradd -r -u 1000 newrelic-lambda-cli
 USER newrelic-lambda-cli
 WORKDIR /home/newrelic-lambda-cli