update image dependencies + update documentation

Dockerfile

@@ -1,6 +1,6 @@
 ARG CERT_PASSWORD
-ARG DOTNET_SDK_VERSION=9.0.203
-ARG DOTNET_RUNTIME_VERSION=9.0.4
+ARG DOTNET_SDK_VERSION=9.0.300
+ARG DOTNET_RUNTIME_VERSION=9.0.5
 ARG ALPINE_VERSION=3.21
 ARG CONFIG_DIRECTORY_ARG=/config
 FROM mcr.microsoft.com/dotnet/sdk:${DOTNET_SDK_VERSION}-alpine${ALPINE_VERSION}-amd64 AS build-env