Update README.md

This uses the Windows logo (Windows 11) as an embedded SVG with grey color for the icon, as SimpleIcons no longer has a Windows icon for some reason.

README.md

@@ -2,7 +2,7 @@
 
 [![Stand With Ukraine](https://raw.githubusercontent.com/vshymanskyy/StandWithUkraine/main/badges/StandWithUkraine.svg)](https://stand-with-ukraine.pp.ua)
 [![Linux Status](https://img.shields.io/github/actions/workflow/status/nanomsg/nng/linux.yml?branch=dev2.0&logoColor=grey&logo=ubuntu&label=)](https://github.com/nanomsg/nng/actions)
-[![Windows Status](https://img.shields.io/github/actions/workflow/status/nanomsg/nng/windows.yml?branch=dev2.0&logoColor=grey&logo=windows&label=)](https://github.com/nanomsg/nng/actions)
+[![Windows Status](https://img.shields.io/github/actions/workflow/status/nanomsg/nng/windows.yml?branch=dev2.0&logoColor=grey&logo=data:image/svg%2bxml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHZpZXdCb3g9IjAgMCA0ODc1IDQ4NzUiPjxwYXRoIGZpbGw9ImdyZXkiIGQ9Ik0wIDBoMjMxMXYyMzEwSDB6bTI1NjQgMGgyMzExdjIzMTBIMjU2NHpNMCAyNTY0aDIzMTF2MjMxMUgwem0yNTY0IDBoMjMxMXYyMzExSDI1NjQiLz48L3N2Zz4=±&label=)](https://github.com/nanomsg/nng/actions)
 [![macOS Status](https://img.shields.io/github/actions/workflow/status/nanomsg/nng/darwin.yml?branch=dev2.0&logoColor=grey&logo=apple&label=)](https://github.com/nanomsg/nng/actions)
 [![Coverage](https://img.shields.io/codecov/c/github/nanomsg/nng?logo=codecov&logoColor=grey&label=)](https://codecov.io/gh/nanomsg/nng)
 [![Discord](https://img.shields.io/discord/639573728212156478?label=&logo=discord)](https://discord.gg/Xnac6b9)