Bump vendor/github.com/feedbin/feedbin from a3fe0c8 to 21aeb9f

Bumps [vendor/github.com/feedbin/feedbin](https://github.com/feedbin/feedbin) from `a3fe0c8` to `21aeb9f`.
- [Commits](feedbin/feedbin@a3fe0c8...21aeb9f)

---
updated-dependencies:
- dependency-name: vendor/github.com/feedbin/feedbin
  dependency-type: direct:production
...

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