Update the PackageReferences for crypto OOBs in netstandard.depproj

Update the PackageReferences for crypto OOBs in netstandard.depproj

The 4.5.0 ref/netstandard2.0 had three properties declared get/set which were
actually get-only.  Updating the depproj version allows removal of the
ApiCompat errors in the shims.

While only 4.5.1 is required, the consensus was to just upgrade all of these
references to the latest versions.  Cng (4.5.0) is already at the newest.

Commit migrated from https://github.com/dotnet/corefx/commit/8b16e3ebf4f4c8be6ed6d744451c512a4d927750