Reduce required version of Microsoft.CodeAnalysis to enable building on .NET 8 installed via Ubuntu feed (#1822)

Author: bkoelman

package-versions.props

@@ -1,7 +1,7 @@
 <Project>
   <PropertyGroup>
     <!-- Published dependencies (only update on major version change) -->
-    <CodeAnalysisFrozenVersion>4.13.0</CodeAnalysisFrozenVersion>
+    <CodeAnalysisFrozenVersion>4.8.0</CodeAnalysisFrozenVersion>
     <DemystifierFrozenVersion>0.4.1</DemystifierFrozenVersion>
     <HumanizerFrozenVersion>2.14.1</HumanizerFrozenVersion>
     <NewtonsoftJsonFrozenVersion>13.0.4</NewtonsoftJsonFrozenVersion>

src/JsonApiDotNetCore.SourceGenerators/ControllerSourceGenerator.cs

@@ -5,7 +5,7 @@
 using Microsoft.CodeAnalysis.CSharp.Syntax;
 using Microsoft.CodeAnalysis.Text;
 
-// To debug in Visual Studio (requires v17.13 or higher):
+// To debug in Visual Studio (requires v17.8 or higher):
 // - Set JsonApiDotNetCore.SourceGenerators as startup project
 // - Add a breakpoint at the start of the Initialize method
 // - Optional: change targetProject in Properties\launchSettings.json