Update Code to 1.90.0 (#6824)

Additionally:

- Update Node to 20.11.1
- Update documentation
- Disable extension signature verification

This works around an issue where the Open VSX is not returning the
expected zip.  Verification is skipped later anyway because
@vscode/vsce-sign is missing in the OSS version.

docs/CONTRIBUTING.md

@@ -37,7 +37,7 @@ for [VS
 Code](https://github.com/Microsoft/vscode/wiki/How-to-Contribute#prerequisites).
 Here is what is needed:
 
-- `node` v18.x
+- `node` v20.x
 - `git` v2.x or greater
 - [`git-lfs`](https://git-lfs.github.com)
 - [`yarn`](https://classic.yarnpkg.com/en/)

docs/android.md

@@ -11,7 +11,7 @@ curl -o- https://raw.githubusercontent.com/nvm-sh/nvm/v0.39.0/install.sh | bash
 ```
 
 6. Exit the terminal using `exit` and then reopen the terminal
-7. Install and use Node.js 18:
+7. Install and use Node.js 20:
 
 ```shell
 nvm install 18

docs/npm.md

@@ -30,7 +30,7 @@ includes installing instructions based on your operating system.
 ## Node.js version
 
 We use the same major version of Node.js shipped with Code's remote, which is
-currently `18.x`. VS Code also [lists Node.js
+currently `20.x`. VS Code also [lists Node.js
 requirements](https://github.com/microsoft/vscode/wiki/How-to-Contribute#prerequisites).
 
 Using other versions of Node.js [may lead to unexpected
@@ -79,7 +79,7 @@ Proceed to [installing](#installing)
 ## FreeBSD
 
 ```sh
-pkg install -y git python npm-node18 pkgconf
+pkg install -y git python npm-node20 pkgconf
 pkg install -y libinotify
 ```
 

docs/termux.md

@@ -57,7 +57,7 @@ npm config set python python3
 node -v
 ```
 
-you will get Node version `v18`
+you will get Node version `v20`
 
 5. Now install code-server following our guide on [installing with npm](./npm.md)