[windows] override C++20 and upgrade nan package

Summary: We specify C++17 to override the default C++ edition for Visual Studio, C++20, which is not compatible with ZW. Additionally, the addon needs a newer version of the nan package to compile.

Test Plan: able to build the windows push notifications addon now

Reviewers: ashoat, marcin

Reviewed By: ashoat

Subscribers: tomek

Differential Revision: https://phab.comm.dev/D13004