On master (c561f2f06ed25f08f7776ac41aeb2999ebe79550) the commit in Guix repo from bitcoin/bitcoin#23778 seems unavailable:
0$ git checkout fa17abf1af09570708daa28dd40ffbc932ebe25c
1fatal: reference is not a tree: fa17abf1af09570708daa28dd40ffbc932ebe25c
This PR points Guix to the current top of the “version-1.4.0” branch.
Fixes #24040.