Update curlconverter

[verhovsky]

Currently, the extension ships curlconverter v3. We can’t upgrade because v4 uses top-level await statements, so it must be an ES module (ESM), but VS Code doesn’t support ES modules in extensions:

electron/electron#21457

microsoft/vscode#201935 (released as VS Code 1.88)

[stevennyman]

Looks like ESM will ship in Electron 28 (scheduled for stable release December 5) so hopefully VSCode will support it soon afterwards.

[verhovsky]

microsoft/vscode#130367

[F-loat]

Something like vite-plugin-top-level-await might help.