build(deps-dev): bump vsce in /src/projektanker.code-butler

Bumps [vsce](https://github.com/Microsoft/vsce) from 1.100.1 to 2.15.0.
- [Release notes](https://github.com/Microsoft/vsce/releases)
- [Commits](microsoft/vscode-vsce@v1.100.1...v2.15.0)

---
updated-dependencies:
- dependency-name: vsce
  dependency-type: direct:development
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>