chore(deps): bump github.com/peterbourgon/ff/v3 from 3.0.0 to 3.1.2

Bumps [github.com/peterbourgon/ff/v3](https://github.com/peterbourgon/ff) from 3.0.0 to 3.1.2.
- [Release notes](https://github.com/peterbourgon/ff/releases)
- [Commits](peterbourgon/ff@v3.0.0...v3.1.2)

---
updated-dependencies:
- dependency-name: github.com/peterbourgon/ff/v3
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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