Update Microsoft.Extensions.Configuration.UserSecrets requirement

Updates the requirements on [Microsoft.Extensions.Configuration.UserSecrets](https://github.com/dotnet/runtime) to permit the latest version.
- [Release notes](https://github.com/dotnet/runtime/releases)
- [Commits](https://github.com/dotnet/runtime/commits)

---
updated-dependencies:
- dependency-name: Microsoft.Extensions.Configuration.UserSecrets
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

src/SwedbankPay.Sdk.Tests/SwedbankPay.Sdk.Tests.csproj

@@ -43,7 +43,7 @@
     <PackageReference Include="Microsoft.Extensions.Configuration.Binder" Version="5.0.*" />
     <PackageReference Include="Microsoft.Extensions.Configuration.EnvironmentVariables" Version="5.0.*" />
     <PackageReference Include="Microsoft.Extensions.Logging.Abstractions" Version="5.0.*" />
-    <PackageReference Include="Microsoft.Extensions.Configuration.UserSecrets" Version="5.0.*" />
+    <PackageReference Include="Microsoft.Extensions.Configuration.UserSecrets" Version="7.0.*" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.10.*" />
     <PackageReference Include="NSubstitute" Version="4.2.2" />
     <PackageReference Include="xunit" Version="2.4.1" />