fix: Dockerfile to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-ALPINE319-EXPAT-7908399
- https://snyk.io/vuln/SNYK-ALPINE319-EXPAT-7908400
- https://snyk.io/vuln/SNYK-ALPINE319-EXPAT-7908409
- https://snyk.io/vuln/SNYK-ALPINE319-BUSYBOX-6928845
- https://snyk.io/vuln/SNYK-ALPINE319-BUSYBOX-6928846

Dockerfile

@@ -1,12 +1,12 @@
 # syntax=docker/dockerfile:1
 
-FROM python:3.13.0a5-alpine AS builder
+FROM python:3.13.0rc1-alpine AS builder
 RUN apt-get update & apt-get upgrade
 WORKDIR /app
 RUN git clone https://github.com/threatcode/GitHacker.git
 RUN cd GitHacker && pip install -r requirements.txt && python setup.py sdist bdist_wheel
 
-FROM python:3.13.0a5-alpine 
+FROM python:3.13.0rc1-alpine 
 COPY --from=builder /app/GitHacker/dist/ /app/
 RUN pip install /app/*.whl
 ENV GIT_PYTHON_REFRESH=quiet