pnpm 9 does not support node 16. I will investigate if node 16 support is still needed.

https://pnpm.io/installation#compatibility

• VS Code's Aug 2023 release was the first one that shipped with Node 18 (up from 16): https://code.visualstudio.com/updates/v1_82#_engineering
• Node 16 was end-of-life'd on 2023-09-11: https://nodejs.org/en/blog/announcements/nodejs16-eol
• For JetBrains, we use the agent binary that bundles Node (20), so we don't depend on Node 16 even if that's what is installed on the system.

My recommendation is that we should stop testing and supporting Node 16, and instead bump this to Node 18.

#3907