[bug#74872] bugfix: update symlinks

[ngraves]

For some reason, rename-file fails when the target and destination are 
not in the same filesystem. However, we can't assume for the 
update-symlink script that all users will always have e.g. 
~/.local/share/applications (managed by guix-home) and ~ on the same 
filesystem. My use-case is trying to implement home impermanence. The 
patch is attached.

0001-gnu-home-Replace-rename-in-update-symlinks-scripts.patch
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