Bump ubuntu from 562456a to 3f85b7c in /Docker/Linux (#241)

Bumps ubuntu from `562456a` to `3f85b7c`.

---
updated-dependencies:
- dependency-name: ubuntu
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Alan Jowett <alanjo@microsoft.com>

Docker/Linux/Dockerfile

@@ -1,7 +1,7 @@
 # Copyright (c) Microsoft Corporation
 # SPDX-License-Identifier: MIT
 
-FROM ubuntu:24.04@sha256:562456a05a0dbd62a671c1854868862a4687bf979a96d48ae8e766642cd911e8
+FROM ubuntu:24.04@sha256:3f85b7caad41a95462cf5b787d8a04604c8262cdcdf9a472b8c52ef83375fe15
 
 # Install dependencies
 RUN apt-get update && apt-get install -y \