owut: update to 2024.07.21

owut: update to 2024.07.21

A couple of minor bug fixes, and several enhancements.

The major addition is the pre-install hook, which allows user to
intercept processing between the download and install.  This allows,
for example, copying the download artifacts (firmware-manifest.json)
to persistent storage and saving it for later reference.  Other
uses include automating backups as part of the upgrade process.
See /etc/owut.d/pre-install.sh for examples.

- bugs
  https://github.com/efahl/owut/commit/dc521b2 version list bug fix
  https://github.com/efahl/owut/commit/75faac2 fix OpenWRT firmware version comparisons
- enhancements
  https://github.com/efahl/owut/commit/0937933 add '--pre-install' hook
  https://github.com/efahl/owut/commit/23c2066 reduce 'dump' output verbosity
  https://github.com/efahl/owut/commit/cc9618d tweak the undocumented '--device' option handling
  https://github.com/efahl/owut/commit/2ec138b improve help

Signed-off-by: Eric Fahlgren <ericfahlgren@gmail.com>