Unpin testing from VS Code 1.47.0

[chrisjsewell]

In #27 tests were pinned to this version, since there was failures using the latest version.

I should:

• find the newest version that does still and at least update to that,
• work out what the actual issue is with the newest version
• think of the best way to pin to a vscode version, but also point out when this is getting old. Or maybe something like running for a pinned version and runnning for the latest version (but allowing this to fail)