vss-tools: update to current master commit

Update the vss-tools submodule to the current master commit to get
various improvements including the change of 'enum' to 'allowed' in the
rule set.

Submodule vss-tools 579c58f..0894e95:
  > Fixing versioning according to packaging guides
  > Adding FAQ
  > vspec2binary.py enum name replaced by allowed.
  > Binary tool enum name replaced by allowed.
  > [CORE] Move from `enum` to `allowed`
  > Adding support for types listed in vehicle-signal-specification in (#134)
  > Feature/validate nameing conventions (#128)
  > [BUILD] Python version updated to 3.8.12
  > [BUILD] Move from `requirements.txt` to `Pipfile`
  > go module version update.
  > Use argparse for YAML generation. Allow optional strict checking (#117)
  > Removing dead code in csv generator (#126)
  > Removing obsolete entries from VSS-tools (#124)

Signed-off-by: Stephen Lawrence <stephen.lawrence@renesas.com>