Revert "Bump Microsoft.Extensions.Logging from 6.0.0 to 7.0.0 (#1948)" (#1949)

This reverts commit 7277b2d.

It's not compatible with `netcoreapp3.1`.

Author: andyleejordan

src/PowerShellEditorServices/PowerShellEditorServices.csproj

@@ -27,7 +27,7 @@
   <ItemGroup>
     <PackageReference Include="Microsoft.CSharp" Version="4.7.0" />
     <PackageReference Include="Microsoft.Extensions.FileSystemGlobbing" Version="6.0.0" />
-    <PackageReference Include="Microsoft.Extensions.Logging" Version="7.0.0" />
+    <PackageReference Include="Microsoft.Extensions.Logging" Version="6.0.0" />
     <!-- Manually pull in the updated version of Newtonsoft.Json. -->
     <PackageReference Include="Newtonsoft.Json" Version="13.0.1" />
     <PackageReference Include="OmniSharp.Extensions.LanguageServer" Version="0.19.6" />

test/PowerShellEditorServices.Test.E2E/PowerShellEditorServices.Test.E2E.csproj

@@ -7,7 +7,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.Extensions.Logging" Version="7.0.0" />
+    <PackageReference Include="Microsoft.Extensions.Logging" Version="6.0.0" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.3.2" />
     <PackageReference Include="Newtonsoft.Json" Version="13.0.1" />
     <PackageReference Include="OmniSharp.Extensions.LanguageClient" Version="0.19.6" />