Update release tool to .NET 8 and update dependencies (#7292)

Co-authored-by: Justin Anderson <jander-msft@users.noreply.github.com>

eng/pipelines/stages/preparerelease.yml

@@ -22,10 +22,10 @@ stages:
       - group: Release-Pipeline
     steps:
     - task: UseDotNet@2
-      displayName: 'Use .NET 6'
+      displayName: 'Use .NET 8'
       inputs:
         packageType: runtime
-        version: 6.x
+        version: 8.x
         installationPath: '$(Build.Repository.LocalPath)\.dotnet'
 
     - script: mkdir $(System.ArtifactsDirectory)\StagingToolLogs

eng/release/DiagnosticsReleaseTool/DiagnosticsReleaseTool.csproj

@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
     <ManagePackageVersionsCentrally>false</ManagePackageVersionsCentrally>
   </PropertyGroup>
 
@@ -13,15 +13,15 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.Extensions.Configuration" Version="[6.0.0]" />
-    <PackageReference Include="Microsoft.Extensions.Configuration.Json" Version="[6.0.0]" />
-    <PackageReference Include="Microsoft.Extensions.Logging" Version="[6.0.0]" />
-    <PackageReference Include="Microsoft.Extensions.Logging.Abstractions" Version="[6.0.0]" />
-    <PackageReference Include="Microsoft.Extensions.Logging.Configuration" Version="[6.0.0]" />
-    <PackageReference Include="Microsoft.Extensions.Logging.Console" Version="[6.0.0]" />
+    <PackageReference Include="Microsoft.Extensions.Configuration" Version="[8.0.0]" />
+    <PackageReference Include="Microsoft.Extensions.Configuration.Json" Version="[8.0.0]" />
+    <PackageReference Include="Microsoft.Extensions.Logging" Version="[8.0.0]" />
+    <PackageReference Include="Microsoft.Extensions.Logging.Abstractions" Version="[8.0.0]" />
+    <PackageReference Include="Microsoft.Extensions.Logging.Configuration" Version="[8.0.0]" />
+    <PackageReference Include="Microsoft.Extensions.Logging.Console" Version="[8.0.0]" />
 
     <PackageReference Include="Azure.Identity" Version="[1.12.0]" />
-    <PackageReference Include="Azure.Storage.Blobs" Version="[12.20.0]" />
+    <PackageReference Include="Azure.Storage.Blobs" Version="[12.21.2]" />
     <PackageReference Include="System.CommandLine" Version="2.0.0-beta1.20468.1" />
   </ItemGroup>