devel/electron2[2-5]: force directory/file permissions in yarn cache archive

There has been a size/checksum mismatch when creating a yarn cache
archive for users with umask other than 022. To ensure reproducibility
of the cache file, force use of 755 and 644 permissions regardless of
umask value.

Reported by: Joe Hu <vegertar_at_gmail_dot_com> (private mail)
MFH: 2023Q3