chore(deps): update dotnet-sdk to v9

Dockerfile

@@ -1,6 +1,6 @@
 # https://github.com/Azure/azure-cli/issues/19591
 # https://iceburn.medium.com/azure-cli-docker-containers-7059750be1f2
-FROM mcr.microsoft.com/dotnet/runtime-deps:8.0-alpine AS base
+FROM mcr.microsoft.com/dotnet/runtime-deps:9.0-alpine AS base
 ENV DOTNET_CLI_TELEMETRY_OPTOUT=true \
     AZ_INSTALLER=DOCKER
 RUN apk add --no-cache py3-pip && \
@@ -13,7 +13,7 @@ ENV ASPNETCORE_URLS=http://+:8080
 ENV AZURE_CONFIG_DIR=/app/.azure
 
 
-FROM mcr.microsoft.com/dotnet/sdk:8.0-alpine AS publish
+FROM mcr.microsoft.com/dotnet/sdk:9.0-alpine AS publish
 WORKDIR /src
 COPY . .
 RUN dotnet publish "AzureCliCredentialProxy.csproj" -c Release -r linux-musl-x64 -o /app/publish

global.json

@@ -1,6 +1,6 @@
 {
   "sdk": {
-    "version": "8.0.402",
+    "version": "9.0.101",
     "rollForward": "latestMinor",
     "allowPrerelease": false
   }