This is a known issue with VSCode (previous post here: https://community.jaredwolff.com/d/223-zephyr-tools-setup-error)
I’ll copy the solution for anyone else who may come along later:
Turns out it’s an issue with VSCode itself. Since I’m using Let’s Encrypt they haven updated the CA cert for that. It should be updated in the near future. In the meantime you can do what’s recommended here: https://github.com/microsoft/vscode/issues/136787
If you search for system certificates in your VSCode settings it should come right up.