west.yaml: Update LittleFS to version 2.8.1 from upstream

The commit shifts sha of Zephyr LittleFS fork to revision
that includes merge of tag v2.8.1 from upstream:
https://github.com/littlefs-project/littlefs/releases/tag/v2.8.1

Signed-off-by: Dominik Ermel <dominik.ermel@nordicsemi.no>
1 file changed