build(deps): Bump @rushstack/ts-command-line from 4.11.1 to 4.21.0

Bumps [@rushstack/ts-command-line](https://github.com/microsoft/rushstack/tree/HEAD/libraries/ts-command-line) from 4.11.1 to 4.21.0.
- [Changelog](https://github.com/microsoft/rushstack/blob/main/libraries/ts-command-line/CHANGELOG.md)
- [Commits](https://github.com/microsoft/rushstack/commits/@rushstack/ts-command-line_v4.21.0/libraries/ts-command-line)

---
updated-dependencies:
- dependency-name: "@rushstack/ts-command-line"
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>