Update Unified Dockerfile to .NET 8 (#208)

* Update Dockerfile image to .NET 8

* Update Dockerfile image to .NET 8

docker-unified/Dockerfile

@@ -34,7 +34,7 @@ RUN VERSION=$(cat version.txt) \
 ###############################################
 #                 Build stage                 #
 ###############################################
-FROM --platform=$BUILDPLATFORM mcr.microsoft.com/dotnet/sdk:6.0 AS dotnet-build
+FROM --platform=$BUILDPLATFORM mcr.microsoft.com/dotnet/sdk:8.0 AS dotnet-build
 
 # Docker buildx supplies the value for this arg
 ARG TARGETPLATFORM
@@ -173,7 +173,7 @@ RUN . /tmp/rid.txt && dotnet publish -c release -o /app/Scim --no-restore --no-s
 ###############################################
 #                  App stage                  #
 ###############################################
-FROM mcr.microsoft.com/dotnet/aspnet:6.0
+FROM mcr.microsoft.com/dotnet/aspnet:8.0
 ARG TARGETPLATFORM
 LABEL com.bitwarden.product="bitwarden"
 LABEL com.bitwarden.project="unified"