hal0 v0.8.1-beta.2

Bugfix on the 0.8.1 beta line — restores fleet auto-update. Safe upgrade from
v0.8.1-beta.1.

Fixed

• Updater version comparison uses PEP 440. hal0 update compared versions with
  a digit-tuple parser that split on . and stripped non-digits per segment, so the
  pip-normalised installed beta 0.8.0b3 parsed to (0, 8, 3) and the tag-form
  manifest 0.8.1-beta.1 to (0, 8, 1, 1) — (0,8,1,1) > (0,8,3) is false, so
  every box on a 0.8.0bN beta saw the new release as "not newer" and hal0 update
  reported nothing to apply (the installed beta number was misread as the patch
  component). The comparator now uses packaging.version.Version in both the updater
  and the API route, falling back to the digit-tuple only for non-PEP-440 nightly
  tags (whose timestamp ordering still relies on it). (#957)