Bump omnibus from `6d109b6` to `9ffcd89` in /omnibus
Bump omnibus from `6d109b6` to `9ffcd89` in /omnibus

Bumps [omnibus](https://github.com/chef/omnibus) from `6d109b6` to `9ffcd89`.
- [Release notes](https://github.com/chef/omnibus/releases)
- [Commits](https://github.com/chef/omnibus/compare/6d109b6cd7bf35e4d0f4ca0bb5378b1d430e44df...9ffcd89d078b3467be0480b138841ee82dd2d5d4)

---
updated-dependencies:
- dependency-name: omnibus
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>
chef/chef,chef/chef,tas50/chef-1,tas50/chef-1,tas50/chef-1,MsysTechnologiesllc/chef,MsysTechnologiesllc/chef,MsysTechnologiesllc/chef,chef/chef,gene1wood/chef,MsysTechnologiesllc/chef,gene1wood/chef,gene1wood/chef,chef/chef,gene1wood/chef,tas50/chef-1