Fix warning-as-error build break by using InvariantCulture explicitly.
Fix warning-as-error build break by using InvariantCulture explicitly.

projectkudu/SiteExtensionGallery,projectkudu/SiteExtensionGallery,mtian/SiteExtensionGallery,mtian/SiteExtensionGallery,skbkontur/NuGetGallery,grenade/NuGetGallery_download-count-patch,skbkontur/NuGetGallery,skbkontur/NuGetGallery,ScottShingler/NuGetGallery,projectkudu/SiteExtensionGallery,grenade/NuGetGallery_download-count-patch,ScottShingler/NuGetGallery,grenade/NuGetGallery_download-count-patch,mtian/SiteExtensionGallery,ScottShingler/NuGetGallery