fix: Dockerfile to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-DEBIAN12-SQLITE3-6139924
- https://snyk.io/vuln/SNYK-DEBIAN12-ZLIB-6008963
- https://snyk.io/vuln/SNYK-DEBIAN12-PAM-8352887
- https://snyk.io/vuln/SNYK-DEBIAN12-PAM-8352887
- https://snyk.io/vuln/SNYK-DEBIAN12-PAM-8352887

Dockerfile

@@ -1,5 +1,5 @@
 # Container image that runs your code
-FROM python:3.13.0rc2-slim
+FROM python:3.14.0a1-slim
 
 # Copies your code file from your action repository to the filesystem path `/` of the container
 COPY entrypoint.sh /entrypoint.sh