Bump @vscode/vsce from 2.20.1 to 2.21.0 (#200)

Bumps [@vscode/vsce](https://github.com/Microsoft/vsce) from 2.20.1 to 2.21.0.
- [Release notes](https://github.com/Microsoft/vsce/releases)
- [Commits](microsoft/vscode-vsce@v2.20.1...v2.21.0)

---
updated-dependencies:
- dependency-name: "@vscode/vsce"
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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