Update neurodebian to use `/etc/apt/keyrings`

This still doesn't fix trixie/sid (because we need a new upstream key for that), but at least it updates the existing builds to the `apt-key`-less configuration. 🦾

library/neurodebian

@@ -1,6 +1,6 @@
 Maintainers: Yaroslav Halchenko <[email protected]> (@yarikoptic)
 GitRepo: https://github.com/neurodebian/dockerfiles.git
-GitCommit: a0af1d460705d7efc9d6de9483f1ce4aa48ad152
+GitCommit: 89ca52860d80889fd878392a29150e46d9d91a71
 
 Tags: focal, nd20.04
 Architectures: amd64, arm64v8