Please see our Linux kernel policy.
Linux 6.1 is an LTS release and we track LTS kernels for 5 years.
After Linux 6.1 is released, Linux 6.0 will get security updates from upstream for approximately 3 months before it is no longer supported with security updates.
The last Linux LTS 5.15 is missing too many features for us to support across our entire product line so Linux 6.1 will be the first long term stable maintained release.
To stop kernel updates, just disable or remove the libre-computer-deb.list from /etc/apt/sources.list.d/. Everything else will still update like normal.