fix: templates/python.dockerfile to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-ALPINE317-EXPAT-7908295
- https://snyk.io/vuln/SNYK-ALPINE317-EXPAT-7908296
- https://snyk.io/vuln/SNYK-ALPINE317-EXPAT-7908297
- https://snyk.io/vuln/SNYK-ALPINE317-NCURSES-5606599
- https://snyk.io/vuln/SNYK-ALPINE317-NCURSES-5606599

templates/python.dockerfile

@@ -1,11 +1,11 @@
-FROM python:3.12.0a2-alpine AS builder
+FROM python:3.13.0rc1-alpine AS builder
 
 WORKDIR /usr/src/function/
 ADD source.tar.gz /usr/src/function/
 RUN python3 -m compileall -f -b /usr/src/function/
 
 
-FROM python:3.12.0a2-alpine AS runtime
+FROM python:3.13.0rc1-alpine AS runtime
 
 COPY --from=builder /usr/src/function/*.pyc /usr/local/bin/function/
 RUN chmod +x /usr/local/bin/function/*.pyc