Updated base image for dotnet

Author: ganrad

dockerfile

@@ -1,4 +1,4 @@
-FROM mcr.microsoft.com/dotnet/core/sdk:3.1 AS build-env
+FROM mcr.microsoft.com/dotnet/sdk:3.1 AS build-env
 WORKDIR /app
 
 # copy csproj and restore as distinct layers
@@ -10,7 +10,7 @@ COPY . ./
 RUN dotnet publish -c Release -o out
 
 # Build runtime image
-FROM mcr.microsoft.com/dotnet/core/aspnet:3.1 AS runtime
+FROM mcr.microsoft.com/dotnet/aspnet:3.1 AS runtime
 WORKDIR /app
 COPY --from=build-env /app/out ./
 ENTRYPOINT ["dotnet", "ClaimsApi.dll"]