upgrade ubuntu 20.04 to 24.04 (Azure#28234)

Author: YanaXu

docker/Dockerfile-ubuntu-20.04 renamed to docker/Dockerfile-ubuntu-24.04

@@ -1,4 +1,4 @@
-FROM mcr.microsoft.com/powershell:ubuntu-20.04
+FROM mcr.microsoft.com/powershell:ubuntu-24.04
 RUN apt-get update && apt-get upgrade -y && apt-get clean && rm -rf /var/lib/apt/lists/*
 
 ARG REPOSITORY=PSGallery
@@ -11,9 +11,9 @@ ARG BUILD_DATE=
 ARG VERSION=
 ARG LATEST=
 ARG BLOB_URL=
-ARG IMAGE_NAME=mcr.microsoft.com/azure-powershell:${VERSION}-ubuntu-20.04
+ARG IMAGE_NAME=mcr.microsoft.com/azure-powershell:${VERSION}-ubuntu-24.04
 
-ENV AZUREPS_HOST_ENVIRONMENT="dockerImage/${VERSION}-ubuntu-20.04"
+ENV AZUREPS_HOST_ENVIRONMENT="dockerImage/${VERSION}-ubuntu-24.04"
 
 LABEL maintainer="Azure PowerShell Team <[email protected]>" \
       readme.md="http://aka.ms/azpsdockerreadme" \