Revert "Bump the all-dependencies group with 2 updates (#792)"

This reverts commit 77b77db.

Author: sebastienros

Directory.Packages.props

@@ -28,7 +28,7 @@
 
     <!-- Testing -->
     <PackageVersion Include="Newtonsoft.Json" Version="13.0.3" />
-    <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="17.13.0" />
+    <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="17.12.0" />
     <PackageVersion Include="xunit" Version="2.9.3" />
     <PackageVersion Include="xunit.runner.visualstudio" Version="3.0.2" />
     <PackageVersion Include="xunit.analyzers" Version="1.21.0" />

Versions.props

@@ -2,16 +2,16 @@
   <!-- This file define constants that can be changed per TFM -->
   <PropertyGroup Condition="'$(TargetFramework)' == 'netstandard2.0'">
     <SystemTextJsonPackageVersion>8.0.5</SystemTextJsonPackageVersion>
-    <MicrosoftExtensionsFileProvidersAbstractionsPackageVersion>9.0.0</MicrosoftExtensionsFileProvidersAbstractionsPackageVersion>
+    <MicrosoftExtensionsFileProvidersAbstractionsPackageVersion>6.0.1</MicrosoftExtensionsFileProvidersAbstractionsPackageVersion>
   </PropertyGroup>
 
   <PropertyGroup Condition="'$(TargetFramework)' == 'net6.0'">
     <SystemTextJsonPackageVersion>8.0.5</SystemTextJsonPackageVersion>
-    <MicrosoftExtensionsFileProvidersAbstractionsPackageVersion>9.0.0</MicrosoftExtensionsFileProvidersAbstractionsPackageVersion>
+    <MicrosoftExtensionsFileProvidersAbstractionsPackageVersion>6.0.1</MicrosoftExtensionsFileProvidersAbstractionsPackageVersion>
   </PropertyGroup>
 
   <PropertyGroup Condition="'$(TargetFramework)' == 'net8.0'">
-    <MicrosoftExtensionsFileProvidersAbstractionsPackageVersion>9.0.0</MicrosoftExtensionsFileProvidersAbstractionsPackageVersion>
+    <MicrosoftExtensionsFileProvidersAbstractionsPackageVersion>8.0.0</MicrosoftExtensionsFileProvidersAbstractionsPackageVersion>
   </PropertyGroup>
 
   <PropertyGroup Condition="'$(TargetFramework)' == 'net9.0'">