Bump Microsoft.Extensions.Configuration.EnvironmentVariables

Bumps [Microsoft.Extensions.Configuration.EnvironmentVariables](https://github.com/dotnet/runtime) from 5.0.0 to 6.0.0.
- [Release notes](https://github.com/dotnet/runtime/releases)
- [Commits](dotnet/runtime@v5.0.0...v6.0.0)

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

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

test/MongoDB.Abstracts.Tests/MongoDB.Abstracts.Tests.csproj

@@ -19,7 +19,7 @@
 		<PackageReference Include="DataGenerator" Version="5.0.0.178" />
 		<PackageReference Include="FluentAssertions" Version="6.2.0" />
 		<PackageReference Include="MartinCostello.Logging.XUnit" Version="0.2.0" />
-		<PackageReference Include="Microsoft.Extensions.Configuration.EnvironmentVariables" Version="5.0.0" />
+		<PackageReference Include="Microsoft.Extensions.Configuration.EnvironmentVariables" Version="6.0.0" />
 		<PackageReference Include="Microsoft.Extensions.Configuration.Json" Version="5.0.0" />
 		<PackageReference Include="Microsoft.Extensions.DependencyInjection" Version="5.0.2" />
 		<PackageReference Include="Microsoft.Extensions.Logging" Version="5.0.0" />