Update mcr.microsoft.com/dotnet/sdk:9.0-alpine Docker digest to 512f834 (#610)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

Dockerfile

@@ -8,7 +8,7 @@ RUN yarn build
 
 #Building the Authentication BFF Backend
 
-FROM mcr.microsoft.com/dotnet/sdk:9.0-alpine@sha256:f271ed7d0fd9c5a7ed0acafed8a2bc978bb65c19dcd2eeea0415adef142ffc87 AS generate-authentication-backend
+FROM mcr.microsoft.com/dotnet/sdk:9.0-alpine@sha256:512f8347b0d2f9848f099a8c31be07286955ceea337cadb1114057ed0b15862f AS generate-authentication-backend
 
 COPY bff/src .
 RUN dotnet publish Altinn.Authentication.UI/Altinn.Authentication.UI/Altinn.Authentication.UI.csproj -c Release -r linux-x64 -o /app_output --no-self-contained