Update typings for mocha (#752)

* Update typings for mocha

This is includes an update of the lock file to the v2 format. It's a big
change, but not much is happening here. I thought it best to keep it
separate.

* Fix globalSetup/teardown for mocha

Updating the typings for mocha uncovered an error in how we were
registering global setups and teardowns.

When calling `mocha.globalSetup` or `mocha.globalTeardown`, any
previously registered globals are overwritten. The workaround
is to attach globals directly to the internal options object.

This is a requirement because we are now registering globals in
multiple files.

Unfortunately, the typings for mocha do not permit this and I may need
to fix them again.

Author: aeisenberg

CONTRIBUTING.md

@@ -29,8 +29,7 @@ Here are a few things you can do that will increase the likelihood of your pull
 
 ## Setting up a local build
 
-Make sure you have a fairly recent version of vscode (>1.32) and are using nodejs
-version >=v10.13.0. (Tested on v10.15.1 and v10.16.0).
+Make sure you have installed recent versions of vscode (>= v1.52), node (>=12.16), and npm (>= 7.5.2). Earlier versions will probably work, but we no longer test against them.
 
 ### Installing all packages
 

README.md

@@ -16,7 +16,6 @@ To see what has changed in the last few versions of the extension, see the [Chan
 * Provides an easy way to run queries from the large, open source repository of [CodeQL security queries](https://github.com/github/codeql).
 * Adds IntelliSense to support you writing and editing your own CodeQL query and library files.
 
-
 ## Project goals and scope
 
 This project will track new feature development in CodeQL and, whenever appropriate, bring that functionality to the Visual Studio Code experience.