www/SpectrumKNX: added new port version 1.16.0
a nice KNX monitor with a searchable history.
asyncpg must be downgraded due to a regresion in version 0.31.0:
https://github.com/MagicStack/asyncpg/issues/1334
Check for more details:
https://github.com/martinhoefling/SpectrumKNX