fix

src/EventGridEmulator/Dockerfile

@@ -5,7 +5,7 @@ ENV DOTNET_CLI_TELEMETRY_OPTOUT=true
 ENV DOTNET_ENVIRONMENT=Production
 ENV ASPNETCORE_URLS=http://+:6500
 
-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 . .
 WORKDIR "/src/EventGridEmulator"