move back to System.Collections.Immutable 8

Author: SimonCropp

src/DiffEngine.Tests/GlobalUsings.cs

@@ -0,0 +1,2 @@
+global using System.Collections.Immutable;
+global using System.Management;

src/DiffEngine.Tests/VersionTests.cs

@@ -0,0 +1,21 @@
+#if NETFRAMEWORK
+
+public class VersionTests
+{
+    // work around https://github.com/orgs/VerifyTests/discussions/1366
+    [Fact]
+    public void Immutable()
+    {
+        var assemblyName = typeof(ImmutableDictionary).Assembly.GetName();
+        Assert.Equal(new Version(8, 0, 0, 0), assemblyName.Version);
+    }
+
+    [Fact]
+    public void Management()
+    {
+        var assemblyName = typeof(ManagementQuery).Assembly.GetName();
+        Assert.Equal(new Version(8, 0, 0, 0), assemblyName.Version);
+    }
+}
+
+#endif

src/Directory.Packages.props

@@ -6,7 +6,7 @@
   <ItemGroup>
     <PackageVersion Include="Argon" Version="0.25.0" />
     <PackageVersion Include="Caseless.Fody" Version="1.9.1" />
-    <PackageVersion Include="EmptyFiles" Version="8.5.1" />
+    <PackageVersion Include="EmptyFiles" Version="8.6.0" />
     <PackageVersion Include="Fody" Version="6.9.1" />
     <PackageVersion Include="MarkdownSnippets.MsBuild" Version="27.0.2" />
     <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="17.12.0" />
@@ -15,7 +15,7 @@
     <PackageVersion Include="Resourcer.Fody" Version="1.8.1" />
     <PackageVersion Include="Serilog" Version="4.2.0" />
     <PackageVersion Include="Serilog.Sinks.File" Version="6.0.0" />
-    <PackageVersion Include="System.Collections.Immutable" Version="9.0.0" />
+    <PackageVersion Include="System.Collections.Immutable" Version="8.0.0" />
     <PackageVersion Include="System.Globalization.Extensions" Version="4.3.0" />
     <PackageVersion Include="System.IO.Compression" Version="4.3.0" />
     <PackageVersion Include="System.Management" Version="8.0.0" />