[Snyk] Security upgrade node from 18.14.2-bullseye-slim to 18.19-bullseye-slim

[clean99]

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 - backend/Dockerfile We recommend upgrading to `node:18.19-bullseye-slim`, as this image has only 56 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 | | :------: | :-------------------- | :---- | :--------------- | |  | **721** | Out-of-bounds Write
[SNYK-DEBIAN11-GLIBC-5927133](https://snyk.io/vuln/SNYK-DEBIAN11-GLIBC-5927133) | Proof of Concept | |  | **721** | Out-of-bounds Write
[SNYK-DEBIAN11-GLIBC-5927133](https://snyk.io/vuln/SNYK-DEBIAN11-GLIBC-5927133) | Proof of Concept | |  | **621** | HTTP Request Smuggling
[SNYK-UPSTREAM-NODE-5741793](https://snyk.io/vuln/SNYK-UPSTREAM-NODE-5741793) | Proof of Concept | |  | **621** | Improper Access Control
[SNYK-UPSTREAM-NODE-5843454](https://snyk.io/vuln/SNYK-UPSTREAM-NODE-5843454) | Proof of Concept | |  | **614** | Arbitrary Code Injection
[SNYK-UPSTREAM-NODE-5848038](https://snyk.io/vuln/SNYK-UPSTREAM-NODE-5848038) | 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/clean99/project/0bb8eb43-c41d-4386-a3c4-f78c046b5ccf?utm_source=github&utm_medium=referral&page=fix-pr) 🛠 [Adjust project settings](https://app.snyk.io/org/clean99/project/0bb8eb43-c41d-4386-a3c4-f78c046b5ccf?utm_source=github&utm_medium=referral&page=fix-pr/settings) [//]: # 'snyk:metadata:{"prId":"8aa22af8-19d6-4a65-b92c-0d4007229474","prPublicId":"8aa22af8-19d6-4a65-b92c-0d4007229474","dependencies":[{"name":"node","from":"18.14.2-bullseye-slim","to":"18.19-bullseye-slim"}],"packageManager":"dockerfile","projectPublicId":"0bb8eb43-c41d-4386-a3c4-f78c046b5ccf","projectUrl":"https://app.snyk.io/org/clean99/project/0bb8eb43-c41d-4386-a3c4-f78c046b5ccf?utm_source=github&utm_medium=referral&page=fix-pr","type":"auto","patch":[],"vulns":["SNYK-DEBIAN11-GLIBC-5927133","SNYK-UPSTREAM-NODE-5741793","SNYK-UPSTREAM-NODE-5843454","SNYK-UPSTREAM-NODE-5848038"],"upgrade":["SNYK-DEBIAN11-GLIBC-5927133","SNYK-DEBIAN11-GLIBC-5927133","SNYK-UPSTREAM-NODE-5741793","SNYK-UPSTREAM-NODE-5843454","SNYK-UPSTREAM-NODE-5848038"],"isBreakingChange":false,"env":"prod","prType":"fix","templateVariants":["updated-fix-title","priorityScore"],"priorityScoreList":[721,621,621,614],"remediationStrategy":"vuln"}' --- **Learn how to fix vulnerabilities with free interactive lessons:** 🦉 [Improper Access Control](https://learn.snyk.io/lesson/broken-access-control/?loc=fix-pr) 🦉 [Arbitrary Code Injection](https://learn.snyk.io/lesson/malicious-code-injection/?loc=fix-pr)

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