Bump Microsoft.Extensions.Configuration.EnvironmentVariables

Bumps [Microsoft.Extensions.Configuration.EnvironmentVariables](https://github.com/dotnet/runtime) from 7.0.0-preview.5.22301.12 to 7.0.0-preview.6.22324.4.
- [Release notes](https://github.com/dotnet/runtime/releases)
- [Commits](https://github.com/dotnet/runtime/commits)

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

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

Directory.Build.targets

@@ -5,7 +5,7 @@
     <PackageReference Update="libgit2sharp" Version="0.27.0-preview-0182" />
     <PackageReference Update="Microsoft.EntityFrameworkCore.Design" Version="7.0.0-preview.5.22302.2" />
     <PackageReference Update="Microsoft.EntityFrameworkCore.InMemory" Version="7.0.0-preview.6.22329.4" />
-    <PackageReference Update="Microsoft.Extensions.Configuration.EnvironmentVariables" Version="7.0.0-preview.5.22301.12" />
+    <PackageReference Update="Microsoft.Extensions.Configuration.EnvironmentVariables" Version="7.0.0-preview.6.22324.4" />
     <PackageReference Update="Microsoft.Extensions.Configuration.Json" Version="7.0.0-preview.5.22301.12" />
     <PackageReference Update="Microsoft.Extensions.DependencyInjection" Version="7.0.0-preview.6.22324.4" />
     <PackageReference Update="Microsoft.NET.Test.Sdk" Version="17.3.0-preview-20220612-01" />