fix: Dockerfile to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-ALPINE38-BZIP2-452633
- https://snyk.io/vuln/SNYK-ALPINE38-EXPAT-451858
- https://snyk.io/vuln/SNYK-ALPINE38-MUSL-458276
- https://snyk.io/vuln/SNYK-ALPINE38-MUSL-458276
- https://snyk.io/vuln/SNYK-ALPINE38-SQLITE-458494

Dockerfile

@@ -1,4 +1,4 @@
-FROM python:3.7.0-alpine
+FROM python:3.11.0b4-alpine
 
 RUN mkdir -p /usr/src/app && mkdir /log && \
     apk --no-cache --update add \