Bump omnibus-software from `f6aa2ed` to `caf6ae0` in /omnibus

Bumps [omnibus-software](https://github.com/chef/omnibus-software) from `f6aa2ed` to `caf6ae0`.
- [Release notes](https://github.com/chef/omnibus-software/releases)
- [Commits](https://github.com/chef/omnibus-software/compare/f6aa2edd80c4b896738f843d9e613212c8510481...caf6ae0b5a111f615cc9cfd4d2970136d41d7b8d)

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