Every time, for the last weeks, trying to update localepurge i got the same result …
[keos@keos-pc ~]$ yay -Syyu
[sudo] password for keos:
:: Synchronizing package databases...
core 129.2 KiB 2.69 MiB/s 00:00 [----------------------] 100%
extra 1630.0 KiB 3.70 MiB/s 00:00 [----------------------] 100%
community 5.2 MiB 3.52 MiB/s 00:01 [----------------------] 100%
multilib 155.5 KiB 4.22 MiB/s 00:00 [----------------------] 100%
endeavouros 14.1 KiB 111 KiB/s 00:00 [----------------------] 100%
:: Starting full system upgrade...
there is nothing to do
:: Searching databases for updates...
:: Searching AUR for updates...
-> Missing AUR Packages: stockfish-old
-> Flagged Out Of Date AUR Packages: localepurge
there is nothing to do
[keos@keos-pc ~]$
Exactly what it says 0.7.3.9 can not be found its not yet updated on AUR, Which has nothing to do with Arch or EndeavourOS you have to be patient and wait till the maintainer updates it.