this setting was added in 2016 in commit
bcdd81d9e14d960cf2fc910b622e236728a7fc07
the posibility to preferTempAddress was added to
nixos/network-interface in 2018 in commit
1fec496f384c53df39684035bafb482865d3eff8
preferTempAddress was renamed to tempAddress
in 2020 in commit 2485e6399e1737d9795f836bb057ab0daf719f03
therefore this setting is redundant since nm will use the sysctl option
nixos/network-interfaces: add default to sysctl so that the value for it
is set
networkmanager falls back to it
https://man.archlinux.org/man/NetworkManager.conf.5
31759dc4b7