www/py-searxng-devel: Fix RUN_DEPENDS

• Use PY_TOMLI
• Bump PORTREVISION for dependency change

from requirements.txt:
tomli==2.2.1; python_version < '3.11'

Reference: https://github.com/searxng/searxng/blob/25647c20d1904840d089892bb118390f46c66984/requirements.txt#L18
Approved by: portmgr (blanket)
With hat: python