meta-*: bump poky from 9ce8f26 to 6400741 in the layers group

Bumps the layers group with 1 update: poky.


Updates `poky` from `9ce8f26` to `6400741`

---
updated-dependencies:
- dependency-name: poky
  dependency-version: 6400741e0c11d1620a5ebe394d24deec295236f9
  dependency-type: direct:production
  dependency-group: layers
...

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

Author: dependabot[bot]