manifest: update zephyr revision

[MirkoCovizzi]

Pull fix for null pointer dereference in net/sockets.

sdk-zephyr: nrfconnect/sdk-zephyr#1446

[NordicBuilder]

The following west manifest projects have been modified in this Pull Request:

Name	Old Revision	New Revision	Diff
zephyr	nrfconnect/sdk-zephyr@f6e704c	nrfconnect/sdk-zephyr@c278430 (main)	nrfconnect/[email protected]

Note: This message is automatically posted and updated by the Manifest GitHub Action.

[NordicBuilder]

Test specification

CI/Jenkins/NRF

• Integration Platforms

CI/Jenkins/integration

Test Module	File based changes	Manually selected	West overwrite
desktop52_verification	X
test-fw-nrfconnect-chip	X
test-fw-nrfconnect-fem	X
test-fw-nrfconnect-nrf-iot_cloud	X
test-fw-nrfconnect-nrf-iot_mosh	X
test-fw-nrfconnect-nrf-iot_positioning	X
test-fw-nrfconnect-nrf-iot_samples	X
test-fw-nrfconnect-nrf-iot_thingy91	X
test-fw-nrfconnect-nrf-iot_zephyr_lwm2m	X
test-fw-nrfconnect-rpc	X
test-fw-nrfconnect-rs	X
test-fw-nrfconnect-thread	X
test-sdk-find-my	X
test-sdk-wifi	X

Detailed information of selected test modules

Note: This message is automatically posted and updated by the CI

[NordicBuilder]

You can find the documentation preview for this PR at this link. It will be updated about 10 minutes after the documentation build succeeds.

Note: This comment is automatically posted by the Documentation Publishing GitHub Action.