Update to .net 9

Author: marchermans

SmithingTable/Dockerfile

@@ -1,4 +1,4 @@
-FROM mcr.microsoft.com/dotnet/sdk:8.0 AS build-env
+FROM mcr.microsoft.com/dotnet/sdk:9.0 AS build-env
 WORKDIR /App
 
 # Copy everything
@@ -9,7 +9,7 @@ RUN dotnet restore
 RUN dotnet publish -c Release -o out
 
 # Build runtime image
-FROM mcr.microsoft.com/dotnet/aspnet:8.0
+FROM mcr.microsoft.com/dotnet/aspnet:9.0
 WORKDIR /App
 COPY --from=build-env /App/out .
 ENV ASPNETCORE_SERVER_URLS="http://+:80"

SmithingTable/SmithingTable.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk.Web">
 
     <PropertyGroup>
-        <TargetFramework>net8.0</TargetFramework>
+        <TargetFramework>net9.0</TargetFramework>
         <Nullable>enable</Nullable>
         <ImplicitUsings>enable</ImplicitUsings>
         <DockerDefaultTargetOS>Linux</DockerDefaultTargetOS>