chore: fix all eslint errors after tslint migration

Agent-Logs-Url: https://github.com/rdfjs/rdfxml-streaming-parser.js/sessions/46b14265-34c1-4bd0-b41d-2a2e1a911a1d

Co-authored-by: rubensworks <440384+rubensworks@users.noreply.github.com>

Author: Copilot