Prevent test windows to pull in node 20 (facebook#41200)

Summary:
Since yesterday, Chocolatey is pulling in Node 20 rather than Node 18 for tests.
It ends up that mock-fs is not working with Node 20, so, for the time being, we are going to keep 18.

## Changelog:
[Internal] - Use node 18 instead of 20 for Test Windows

Pull Request resolved: facebook#41200

Test Plan: CircleCI is green

Reviewed By: hoxyq

Differential Revision: D50690846

Pulled By: cipolleschi

fbshipit-source-id: 505b8e8f90b46019d8e582cc8dad2e2d1edffd54

.circleci/configurations/jobs.yml

@@ -601,7 +601,7 @@ jobs:
       - run:
           name: Install Node JS
           # Note: Version set separately for non-Windows builds, see above.
-          command: choco install nodejs-lts
+          command: choco install nodejs --version=18.18.0 --allow-downgrade 
 
       # Setup Dependencies
       - run: