[Snyk] Security upgrade python from 3.10.10-alpine to 3.12.0b3-alpine

[geekzonebotold]

This PR was automatically created by Snyk using the credentials of a real user.

Keeping your Docker base image up-to-date means you’ll benefit from security fixes in the latest version of your chosen image. #### Changes included in this PR - docker/backend/Dockerfile We recommend upgrading to `python:3.12.0b3-alpine`, as this image has only 0 known vulnerabilities. To do this, merge this pull request, then verify your application still works as expected. Some of the most important vulnerabilities in your base image include: | Severity | Priority Score / 1000 | Issue | Exploit Maturity | | :------: | :-------------------- | :---- | :--------------- | |  | **400** | Out-of-bounds Write
[SNYK-ALPINE317-NCURSES-5606599](https://snyk.io/vuln/SNYK-ALPINE317-NCURSES-5606599) | No Known Exploit | |  | **400** | Out-of-bounds Write
[SNYK-ALPINE317-NCURSES-5606599](https://snyk.io/vuln/SNYK-ALPINE317-NCURSES-5606599) | No Known Exploit | |  | **300** | Out-of-bounds Read
[SNYK-ALPINE317-OPENSSL-5438697](https://snyk.io/vuln/SNYK-ALPINE317-OPENSSL-5438697) | No Known Exploit | |  | **400** | Allocation of Resources Without Limits or Throttling
[SNYK-ALPINE317-OPENSSL-5661570](https://snyk.io/vuln/SNYK-ALPINE317-OPENSSL-5661570) | No Known Exploit | |  | **400** | Allocation of Resources Without Limits or Throttling
[SNYK-ALPINE317-OPENSSL-5661570](https://snyk.io/vuln/SNYK-ALPINE317-OPENSSL-5661570) | No Known Exploit | --- **Note:** _You are seeing this because you or someone else with access to this repository has authorized Snyk to open fix PRs._ For more information: 🧐 [View latest project report](https://app.snyk.io/org/geekzonebot/project/d3feb5de-3b61-43e4-8bc4-190cf5ddceae?utm_source=github&utm_medium=referral&page=fix-pr) 🛠 [Adjust project settings](https://app.snyk.io/org/geekzonebot/project/d3feb5de-3b61-43e4-8bc4-190cf5ddceae?utm_source=github&utm_medium=referral&page=fix-pr/settings) [//]: # 'snyk:metadata:{"prId":"34e18828-8b4f-488b-b525-2e4548791587","prPublicId":"34e18828-8b4f-488b-b525-2e4548791587","dependencies":[{"name":"python","from":"3.10.10-alpine","to":"3.12.0b3-alpine"}],"packageManager":"dockerfile","projectPublicId":"d3feb5de-3b61-43e4-8bc4-190cf5ddceae","projectUrl":"https://app.snyk.io/org/geekzonebot/project/d3feb5de-3b61-43e4-8bc4-190cf5ddceae?utm_source=github&utm_medium=referral&page=fix-pr","type":"auto","patch":[],"vulns":["SNYK-ALPINE317-NCURSES-5606599","SNYK-ALPINE317-OPENSSL-5661570","SNYK-ALPINE317-OPENSSL-5438697"],"upgrade":["SNYK-ALPINE317-NCURSES-5606599","SNYK-ALPINE317-NCURSES-5606599","SNYK-ALPINE317-OPENSSL-5438697","SNYK-ALPINE317-OPENSSL-5661570","SNYK-ALPINE317-OPENSSL-5661570"],"isBreakingChange":false,"env":"prod","prType":"fix","templateVariants":["updated-fix-title","priorityScore"],"priorityScoreList":[400,400,300],"remediationStrategy":"vuln"}' --- **Learn how to fix vulnerabilities with free interactive lessons:** 🦉 [Allocation of Resources Without Limits or Throttling](https://learn.snyk.io/lessons/no-rate-limiting/python/?loc=fix-pr)

[sonarcloud[bot]]

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[giulio-giunta]

The suggested Python version to build the image has already been applied in #675