fix: 'text file is busy' error when updating on linux

[unaimeds]

When using the polar update command on Linux (tested on Arch Linux x86_64) an error is thrown:

[13:36:55.502] ERROR (#16):
  Error: Failed to replace binary: ETXTBSY: text file is busy, open '/usr/local/bin/polar'
    at catch (/$bunfs/root/polar:83255:30)

because it's trying to replace the same file from which we've ran the update command.

I updated the code to first write the new binary to a temp file then rename the temp file to target binary path.
Also if the update is ran in directory that's not owned by user an access error will be thrown, it should be now handled and file rename will be re-ran as sudo.