Bump upstream from a3f82ff to d0b4e71

Bumps [upstream](https://github.com/wiedehopf/readsb) from `a3f82ff` to `d0b4e71`.
- [Commits](wiedehopf/readsb@a3f82ff...d0b4e71)

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

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