Bump Microsoft.Extensions.Configuration.Abstractions from 7.0.0 to 8.0.0

Bumps [Microsoft.Extensions.Configuration.Abstractions](https://github.com/dotnet/runtime) from 7.0.0 to 8.0.0.
- [Release notes](https://github.com/dotnet/runtime/releases)
- [Commits](dotnet/runtime@v7.0.0...v8.0.0)

---
updated-dependencies:
- dependency-name: Microsoft.Extensions.Configuration.Abstractions
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

Agent/Agent.csproj

@@ -23,7 +23,7 @@
 
 	<ItemGroup>
 		<PackageReference Include="Microsoft.SourceLink.GitHub" Version="1.1.1" PrivateAssets="all"/>
-		<PackageReference Include="Microsoft.Extensions.Configuration.Abstractions" Version="7.0.0"/>
+		<PackageReference Include="Microsoft.Extensions.Configuration.Abstractions" Version="8.0.0"/>
 		<PackageReference Include="Microsoft.Extensions.Logging.Abstractions" Version="7.0.1"/>
 		<PackageReference Include="System.Text.Json" Version="7.0.3"/>
 		<None Include="../README.md" CopyToOutputDirectory="PreserveNewest" Pack="true" PackagePath="."/>

Middleware/Middleware.csproj

@@ -1,4 +1,4 @@
-<Project Sdk="Microsoft.NET.Sdk">
+<Project Sdk="Microsoft.NET.Sdk">
 
 	<PropertyGroup>
 		<Version>0.4.0</Version>
@@ -20,7 +20,7 @@
 
 	<ItemGroup>
 		<PackageReference Include="Microsoft.AspNetCore.Http.Abstractions" Version="2.2.0"/>
-		<PackageReference Include="Microsoft.Extensions.Configuration.Abstractions" Version="7.0.0"/>
+		<PackageReference Include="Microsoft.Extensions.Configuration.Abstractions" Version="8.0.0"/>
 		<PackageReference Include="Microsoft.Extensions.DependencyInjection.Abstractions" Version="7.0.0"/>
 		<PackageReference Include="Microsoft.Extensions.Http" Version="7.0.0"/>
 		<ProjectReference Include="../Agent/Agent.csproj"/>