Bump phing/phing from 2.16.4 to 2.17.3

Bumps [phing/phing](https://github.com/phingofficial/phing) from 2.16.4 to 2.17.3.
- [Release notes](https://github.com/phingofficial/phing/releases)
- [Changelog](https://github.com/phingofficial/phing/blob/2.17.3/CHANGELOG.md)
- [Commits](phingofficial/phing@2.16.4...2.17.3)

---
updated-dependencies:
- dependency-name: phing/phing
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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