lava_log_parser.py: update requirements
lava_log_parser.py: update requirements

Fix: 8e0b84a lava_log_parser.py: add timestamps to HTML log output

Update the requirements, add python-dateutil. Otherwise the package
is not installed in kernelci venv resulting in module import errors.

Signed-off-by: Loys Ollivier <cf753bdad1a7a04cbd646be8ae1090a890fabf47@baylibre.com>

kernelci/kernelci-backend,kernelci/kernelci-backend