[Snyk] Security upgrade python from 3.11-alpine to 3.12.3-alpine

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 - wopiserver.Dockerfile We recommend upgrading to `python:3.12.3-alpine`, as this image has only 0 known vulnerabilities. To do this, merge this pull request, then verify your application still works as expected. --- **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/cs3org/project/3e053570-7a9f-4949-b208-06629193b7a6?utm_source=github&utm_medium=referral&page=fix-pr) 🛠 [Adjust project settings](https://app.snyk.io/org/cs3org/project/3e053570-7a9f-4949-b208-06629193b7a6?utm_source=github&utm_medium=referral&page=fix-pr/settings) [//]: # 'snyk:metadata:{"prId":"43644dc8-019d-4b00-9f14-43acf2e86b34","prPublicId":"43644dc8-019d-4b00-9f14-43acf2e86b34","dependencies":[{"name":"python","from":"3.11-alpine","to":"3.12.3-alpine"}],"packageManager":"dockerfile","projectPublicId":"3e053570-7a9f-4949-b208-06629193b7a6","projectUrl":"https://app.snyk.io/org/cs3org/project/3e053570-7a9f-4949-b208-06629193b7a6?utm_source=github&utm_medium=referral&page=fix-pr","type":"auto","patch":[],"vulns":[],"upgrade":[],"isBreakingChange":false,"env":"prod","prType":"fix","templateVariants":["updated-fix-title"],"priorityScoreList":[],"remediationStrategy":"vuln"}' --- **Learn how to fix vulnerabilities with free interactive lessons:** 🦉 [Learn about vulnerability in an interactive lesson of Snyk Learn.](https://learn.snyk.io/?loc=fix-pr)

cs3org / wopiserver

[Snyk] Security upgrade python from 3.11-alpine to 3.12.3-alpine #147