build(deps): bump shell-quote from 1.6.1 to 1.7.3 in /www-src

Bumps [shell-quote](https://github.com/substack/node-shell-quote) from 1.6.1 to 1.7.3.
- [Release notes](https://github.com/substack/node-shell-quote/releases)
- [Changelog](https://github.com/substack/node-shell-quote/blob/master/CHANGELOG.md)
- [Commits](https://github.com/substack/node-shell-quote/compare/1.6.1...1.7.3)

---
updated-dependencies:
- dependency-name: shell-quote
  dependency-type: indirect
...

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

Author: dependabot[bot]