Reference fixed Roslyn version (#1081)

This ensures the analyzer supports older compilers.

PropertyChanged.Fody.Analyzer.Tests/PropertyChanged.Fody.Analyzer.Tests.csproj

@@ -12,13 +12,14 @@
     <PackageReference Include="AnalyzerTesting.CSharp.Extensions" Version="1.2.0" />
     <PackageReference Include="Microsoft.CodeAnalysis.CSharp.SourceGenerators.Testing.XUnit" Version="1.1.2" />
     <PackageReference Include="Microsoft.CodeAnalysis.CSharp.Workspaces" Version="4.10.0" NoWarn="NU1608" />
+    <PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="4.10.0" NoWarn="NU1608" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.10.0" />
     <PackageReference Include="Verify.Xunit" Version="26.2.0" />
     <PackageReference Include="xunit" Version="2.9.0" />
     <PackageReference Include="xunit.runner.visualstudio" Version="2.8.2" PrivateAssets="all" />
     <PackageReference Include="coverlet.collector" Version="6.0.2" PrivateAssets="all" />
     <ProjectReference Include="..\PropertyChanged\PropertyChanged.csproj" />
-    <ProjectReference Include="..\PropertyChanged.Fody.Analyzer\PropertyChanged.Fody.Analyzer.csproj" />
+    <ProjectReference Include="..\PropertyChanged.Fody.Analyzer\PropertyChanged.Fody.Analyzer.csproj" NoWarn="NU1608" />
   </ItemGroup>
 
 </Project>

PropertyChanged.Fody.Analyzer/PropertyChanged.Fody.Analyzer.csproj

@@ -7,7 +7,7 @@
   </PropertyGroup>
   <ItemGroup>
     <PackageReference Include="Microsoft.CodeAnalysis.Analyzers" Version="3.3.4" PrivateAssets="all" />
-    <PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="4.8.0" PrivateAssets="All" />
+    <PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="[4.0.1]" PrivateAssets="all" />
     <PackageReference Include="Nullable.Extended.Analyzer" Version="1.10.4539" PrivateAssets="all" />
   </ItemGroup>
-</Project>
+</Project>