chore(deps): update mcr.microsoft.com/dotnet/aspnet docker tag to v9

Author: renovate[bot]

Dockerfile

@@ -7,7 +7,7 @@ RUN dotnet restore LocalTest.csproj
 COPY ./src .
 RUN dotnet publish LocalTest.csproj -c Release -o /app_output
 
-FROM mcr.microsoft.com/dotnet/aspnet:8.0-alpine AS final
+FROM mcr.microsoft.com/dotnet/aspnet:9.0-alpine AS final
 EXPOSE 5101
 WORKDIR /app
 COPY --from=build /app_output .