fix: Dockerfile to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-ALPINE318-EXPAT-6241039
- https://snyk.io/vuln/SNYK-ALPINE318-OPENSSL-6032386
- https://snyk.io/vuln/SNYK-ALPINE318-OPENSSL-6032386
- https://snyk.io/vuln/SNYK-ALPINE318-SQLITE-6179217
- https://snyk.io/vuln/SNYK-ALPINE318-BUSYBOX-6913411

Dockerfile

@@ -1,4 +1,4 @@
-FROM python:3.7-alpine
+FROM python:3.13.0rc1-alpine
 
 LABEL description="Damn Vulnerable GraphQL Application"
 LABEL github="https://github.com/dolevf/Damn-Vulnerable-GraphQL-Application"