Seems like the back branches are still not quite there: I'm seeing Name "PostgreSQL::Test::Utils::windows_os" used only once: possible typo at t/003_extrafiles.pl line 74.
in v12 and v13, while it's Name "PostgreSQL::Test::Utils::windows_os" used only once: possible typo at t/003_extrafiles.pl line 85. in v14. v15 and up are OK. regards, tom lane