Bump markdown-it, ovsx and vsce

Bumps [markdown-it](https://github.com/markdown-it/markdown-it), [ovsx](https://github.com/eclipse/openvsx/tree/HEAD/cli) and [vsce](https://github.com/Microsoft/vsce). These dependencies needed to be updated together.

Updates `markdown-it` from 10.0.0 to 12.3.2
- [Release notes](https://github.com/markdown-it/markdown-it/releases)
- [Changelog](https://github.com/markdown-it/markdown-it/blob/master/CHANGELOG.md)
- [Commits](markdown-it/markdown-it@10.0.0...12.3.2)

Updates `ovsx` from 0.1.0 to 0.5.1
- [Release notes](https://github.com/eclipse/openvsx/releases)
- [Changelog](https://github.com/eclipse/openvsx/blob/master/cli/CHANGELOG.md)
- [Commits](https://github.com/eclipse/openvsx/commits/HEAD/cli)

Updates `vsce` from 1.91.0 to 2.11.0
- [Release notes](https://github.com/Microsoft/vsce/releases)
- [Commits](microsoft/vscode-vsce@v1.91.0...v2.11.0)

---
updated-dependencies:
- dependency-name: markdown-it
  dependency-type: indirect
- dependency-name: ovsx
  dependency-type: direct:development
- dependency-name: vsce
  dependency-type: direct:development
...

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