Auto merge of rust-lang#15174 - tetsuharuohzeki:switch-to-use-vscode-vcse, r=Veykril

editor/code: Switch to `@vscode/vsce`

This follows up rust-lang/rust-analyzer#15151

`vsce` was renamed to ``@vscode/vsce`.` We should switch to it now.

- https://code.visualstudio.com/updates/v1_74#_extension-authoring
- https://www.npmjs.com/package/`@vscode/vsce`

Author: bors