Tests fail on machines with different number format due to bug in aspnet/Configuration

[cwe1ss]

.\test\App.Metrics.Extensions.Middleware.Integration.Facts\DependencyInjection\TestConfiguration\appsettings.json currently contains the line "ApdexTSeconds": 0.8.

Unfortunately, there is a bug in aspnet/Configuration which results in a culture mismatch (the JSON parser writes "0,8" (using CurrentCulture) and IConfiguration.GetValue uses InvariantCulture).

As a result, the following tests fail:

AspNetMetricsCoreBuilderExtensionsTests (2 tests) [0:00.672] Failed: 2 tests failed
   can_load_settings_from_configuration [0:00.018] Failed: Did not expect any exception, but found System.InvalidOperationException with message "Failed to convert '0,8' to type 'System.Double'."
   can_override_settings_from_configuration [0:00.654] Failed: Did not expect any exception, but found System.InvalidOperationException with message "Failed to convert '0,8' to type 'System.Double'."

The suggested workaround is to use "ApdexTSeconds": "0.8" instead.