Response from SR Support:
Unfortunately there is not much good to be done.
We are not providing regular updates to the solidrun repo,
only when generating new full image.
In this case while the warning is scary it has no impact on you, you are not missing out on anything.
Our general hope is that eventually the unpatched official debian can work again.
See below what we actually customised:
And see here the critical piece why we had to patch the kernel package: