update/release: fix/simplify mtime handling

i wasn't getting the very first line of tar --version,
so it wasn't doing the check properly.

further sort the files by name within the tar archive.
for reliability, don't bother using versiondate anymore:
set a *fixed* date, and fixed timezone, to ensure
that it works reliably for reproducible tarball creation.

Signed-off-by: Leah Rowe <leah@libreboot.org>

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