ubuntu server 24.04 - Missing Signed-By in the sources

I have a ubuntu server 24.04.2 LTS

When i execute this command:$ apt-get update
I have this error:

Hit:9 https://packages.redis.io/deb noble InRelease
Fetched 532 kB in 1s (697 kB/s)
Reading package lists... Done
N: Missing Signed-By in the sources.list(5) entry for 'http://nova.clouds.archive.ubuntu.com/ubuntu'
N: Missing Signed-By in the sources.list(5) entry for 'http://nova.clouds.archive.ubuntu.com/ubuntu'

file /etc/apt/sources.list.d/redis.list contains:
deb [signed-by=/usr/share/keyrings/redis-archive-keyring.gpg] https://packages.redis.io/deb noble main

Any idea how to solve this ?