Update mcr.microsoft.com/dotnet/sdk:9.0.305-noble Docker digest to 604ef06

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

Author: renovate[bot]

.devcontainer/Dockerfile

@@ -1,5 +1,5 @@
 # Refer to https://hub.docker.com/_/microsoft-dotnet-sdk for available versions
-FROM mcr.microsoft.com/dotnet/sdk:9.0.305-noble@sha256:802e64ab9e113bdfa5d476ae00c7b40ab5c42da1792731c41a47f43bc4e74bdb
+FROM mcr.microsoft.com/dotnet/sdk:9.0.305-noble@sha256:604ef064c6d91068eeb9d946036d8ffadbe25589c4cd77a230fc96e0f6d01d72
 
 # Installing mono makes `dotnet test` work without errors even for net472.
 # But installing it takes a long time, so it's excluded by default.