[Snyk] Security upgrade ubuntu from 23.04 to mantic-20231011 (#4601)

<p>This PR was automatically created by Snyk using the credentials of a real user.</p><br />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 


- website/Dockerfile

We recommend upgrading to `ubuntu:mantic-20231011`, as this image has only 8 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      |
| :------:                                                                                                                 | :--------------------  | :----                                                                     | :---------------      |
| ![low severity](https://res.cloudinary.com/snyk/image/upload/w_20,h_20/v1561977819/icon/l.png "low severity")   | **150**  | Improper Input Validation <br/>[SNYK-UBUNTU2304-COREUTILS-5484945](https://snyk.io/vuln/SNYK-UBUNTU2304-COREUTILS-5484945)   | No Known Exploit   |
| ![low severity](https://res.cloudinary.com/snyk/image/upload/w_20,h_20/v1561977819/icon/l.png "low severity")   | **150**  | Allocation of Resources Without Limits or Throttling <br/>[SNYK-UBUNTU2304-GLIBC-5484975](https://snyk.io/vuln/SNYK-UBUNTU2304-GLIBC-5484975)   | No Known Exploit   |
| ![medium severity](https://res.cloudinary.com/snyk/image/upload/w_20,h_20/v1561977819/icon/m.png "medium severity")   | **300**  | Memory Leak <br/>[SNYK-UBUNTU2304-GLIBC-5919743](https://snyk.io/vuln/SNYK-UBUNTU2304-GLIBC-5919743)   | No Known Exploit   |
| ![medium severity](https://res.cloudinary.com/snyk/image/upload/w_20,h_20/v1561977819/icon/m.png "medium severity")   | **300**  | Memory Leak <br/>[SNYK-UBUNTU2304-GLIBC-5919743](https://snyk.io/vuln/SNYK-UBUNTU2304-GLIBC-5919743)   | No Known Exploit   |
| ![medium severity](https://res.cloudinary.com/snyk/image/upload/w_20,h_20/v1561977819/icon/m.png "medium severity")   | **300**  | CVE-2020-22916 <br/>[SNYK-UBUNTU2304-XZUTILS-5854648](https://snyk.io/vuln/SNYK-UBUNTU2304-XZUTILS-5854648)   | No Known Exploit   |



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[//]: # 'snyk:metadata:{"prId":"e0abab1a-113a-44b8-b17c-2fb6e9e9de40","prPublicId":"e0abab1a-113a-44b8-b17c-2fb6e9e9de40","dependencies":[{"name":"ubuntu","from":"23.04","to":"mantic-20231011"}],"packageManager":"dockerfile","projectPublicId":"be35e6c9-5393-4702-af3c-f4aebb53488e","projectUrl":"https://app.snyk.io/org/alcion/project/be35e6c9-5393-4702-af3c-f4aebb53488e?utm_source=github-enterprise&utm_medium=referral&page=fix-pr","type":"auto","patch":[],"vulns":["SNYK-UBUNTU2304-GLIBC-5919743","SNYK-UBUNTU2304-XZUTILS-5854648","SNYK-UBUNTU2304-COREUTILS-5484945","SNYK-UBUNTU2304-GLIBC-5484975"],"upgrade":["SNYK-UBUNTU2304-COREUTILS-5484945","SNYK-UBUNTU2304-GLIBC-5484975","SNYK-UBUNTU2304-GLIBC-5919743","SNYK-UBUNTU2304-GLIBC-5919743","SNYK-UBUNTU2304-XZUTILS-5854648"],"isBreakingChange":false,"env":"prod","prType":"fix","templateVariants":["updated-fix-title","priorityScore"],"priorityScoreList":[300,300,150,150],"remediationStrategy":"vuln"}'

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**Learn how to fix vulnerabilities with free interactive lessons:**

 🦉 [Memory Leak](https://learn.snyk.io/lesson/memory-leaks/?loc&#x3D;fix-pr)
 🦉 [Improper Input Validation](https://learn.snyk.io/lesson/improper-input-validation/?loc&#x3D;fix-pr)
 🦉 [Allocation of Resources Without Limits or Throttling](https://learn.snyk.io/lesson/no-rate-limiting/?loc&#x3D;fix-pr)

website/Dockerfile

@@ -1,4 +1,4 @@
-FROM ubuntu:23.04
+FROM ubuntu:mantic-20231011
 LABEL MAINTAINER="Niraj Tolia"
 
 ARG DEBIAN_FRONTEND=noninteractive