Bump Microsoft.Extensions.Configuration.UserSecrets from 6.0.1 to 8.0.0

Bumps [Microsoft.Extensions.Configuration.UserSecrets](https://github.com/dotnet/runtime) from 6.0.1 to 8.0.0.
- [Release notes](https://github.com/dotnet/runtime/releases)
- [Commits](dotnet/runtime@v6.0.1...v8.0.0)

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

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

Digipost.Signature.Api.Client.Core.Tests/Digipost.Signature.Api.Client.Core.Tests.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <ItemGroup>
     <PackageReference Include="Digipost.Api.Client.Shared" Version="7.1.5" />
-    <PackageReference Include="Microsoft.Extensions.Configuration.UserSecrets" Version="6.0.1" />
+    <PackageReference Include="Microsoft.Extensions.Configuration.UserSecrets" Version="8.0.0" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.11.0" />
     <PackageReference Include="NLog" Version="4.7.13" />
     <PackageReference Include="NLog.Extensions.Logging" Version="1.7.4" />

Digipost.Signature.Api.Client.Direct/Digipost.Signature.Api.Client.Direct.csproj

@@ -7,7 +7,7 @@
     </PropertyGroup>
 
     <ItemGroup>
-        <PackageReference Include="Microsoft.Extensions.Configuration.UserSecrets" Version="6.0.1" />
+        <PackageReference Include="Microsoft.Extensions.Configuration.UserSecrets" Version="8.0.0" />
         <PackageReference Include="Microsoft.AspNet.WebApi.Client" Version="5.*" />
         <PackageReference Include="Microsoft.Extensions.Logging" Version="6.0.0" />
         <PackageReference Include="System.Net.Requests" Version="4.*" />