Bump poky from 3810d71 to 78c9cb3

Bumps poky from `3810d71` to `78c9cb3`.

---
updated-dependencies:
- dependency-name: poky
  dependency-version: 78c9cb3eaf071932567835742608404d5ce23cc4
  dependency-type: direct:production
...

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

Author: dependabot[bot]