Nulllink fix (#4114)

## Checks
<!-- check boxes for faster reviewing of your PR -->

- [x] I do not require assistance to complete the PR.
- [x] Before posting/requesting review of a PR, I have verified that the
changes work.
- [x] I have added screenshots/videos of the changes, or this PR does
not change in-game mechanics.
- [x] I affirm that my changes are licensed under the [MIT
License](https://github.com/ss14Starlight/space-station-14/blob/Starlight/LICENSE.TXT)
and grant permission for use in this repository under its conditions.

Author: StarlightHost

Content.Packaging/ServerPackaging.cs

@@ -43,14 +43,6 @@ public static class ServerPackaging
         "System.Diagnostics.EventLog.Messages",   // Starlight
     };
 
-    // Starlight
-    private static readonly HashSet<string> ServerForceContentAssemblies = new()
-    {
-        "Microsoft.Extensions.Configuration.dll",
-        "Microsoft.Extensions.Configuration.Abstractions.dll",
-        "Microsoft.Extensions.Configuration.Binder.dll",
-    };
-
     private static readonly HashSet<string> BinSkipFolders = new()
     {
         // Roslyn localization files, screw em.
@@ -219,11 +211,7 @@ private static IEnumerable<string> GetContentAssemblyNamesToCopy(DepsHandler dep
         var depsContent = deps.RecursiveGetLibrariesFrom("Content.Server").SelectMany(GetLibraryNames);
         var depsRobust = deps.RecursiveGetLibrariesFrom("Robust.Server").SelectMany(GetLibraryNames);
 
-        // Starlight start
-        var depsContentExclusive = depsContent
-            .Where(p => !depsRobust.Contains(p) || ServerForceContentAssemblies.Contains(p))
-            .ToHashSet();
-        // Starlight end
+        var depsContentExclusive = depsContent.Except(depsRobust).ToHashSet();
 
         // Remove .dll suffix and apply filtering.
         var names = depsContentExclusive.Select(p => p[..^4]).Where(p => !ServerNotExtraAssemblies.Any(p.StartsWith));

Directory.Build.targets

@@ -0,0 +1,17 @@
+<Project>
+  <!--
+    Serilog.Sinks.Http 7.2.0 (pulled transitively via Serilog.Sinks.Loki in Robust.Server)
+    hard-pins Microsoft.Extensions.Configuration to 3.1.9. Orleans 10.0.1 (Content.Server)
+    requires 10.0.0 — ConfigurationSection.TryGetValue was added there.
+
+    RobustToolbox has no Directory.Build.targets, so MSBuild traverses up and finds this file
+    for all Robust.* projects too. Adding explicit references here pins the minimum version to
+    10.0.0 in Robust.Server's dependency graph without touching the submodule.
+  -->
+  <ItemGroup Condition="'$(MSBuildProjectName)' == 'Robust.Server'">
+    <PackageVersion Include="Microsoft.Extensions.Configuration" Version="10.0.0" />
+    <PackageVersion Include="Microsoft.Extensions.Configuration.Abstractions" Version="10.0.0" />
+    <PackageReference Include="Microsoft.Extensions.Configuration" />
+    <PackageReference Include="Microsoft.Extensions.Configuration.Abstractions" />
+  </ItemGroup>
+</Project>