Temporary: Back to 4.0.0 for System.Security.Cryptography.X509Certificates

Author: dougbu

src/Microsoft.AspNetCore.Http.Features/project.json

@@ -27,7 +27,7 @@
         "System.Net.WebSockets": "4.0.0-*",
         "System.Runtime.Extensions": "4.1.0-*",
         "System.Security.Claims": "4.0.1-*",
-        "System.Security.Cryptography.X509Certificates": "4.1.0-*",
+        "System.Security.Cryptography.X509Certificates": "4.0.0-*",
         "System.Security.Principal": "4.0.1-*"
       },
       "imports": [