Update Windows docs to require winget instead of choco (#257)

Documentation change for <servo/servo#42372>

Author: dpaoliello

src/building/windows.md

@@ -1,7 +1,8 @@
 # Building for Windows
 
-- Download [`uv`](https://docs.astral.sh/uv/getting-started/installation/#standalone-installer), [`choco`](https://chocolatey.org/install#individual), and [`rustup`](https://win.rustup.rs/)
+- Download [`uv`](https://docs.astral.sh/uv/getting-started/installation/#standalone-installer), and [`rustup`](https://win.rustup.rs/)
   - Be sure to select *Quick install via the Visual Studio Community installer*
+- Ensure that [`winget`](https://learn.microsoft.com/en-us/windows/package-manager/winget/) is available. It should be preinstalled on Windows 10 1809+ and Windows 11, otherwise can be [`manually installed`](https://github.com/microsoft/winget-cli#installing-the-client).
 - In the Visual Studio Installer, ensure the following components are installed:
   - **Windows 10/11 SDK (anything >= 10.0.19041.0)** (`Microsoft.VisualStudio.Component.Windows{10, 11}SDK.{>=19041}`)
   - **MSVC v143 - VS 2022 C++ x64/x86 build tools (Latest)** (`Microsoft.VisualStudio.Component.VC.Tools.x86.x64`)