chore: use letsencrypt by default due to zerossl retry issue

chore: upgrade deps

refactor: Optimize ntp removal from DEPLIST

feat: sync from upstream, version bump

fix: do not change net.core.default_qdisc when installing BBR (#236)

update: use systemd-sysctl instead of sysctl

update: add update script for transmission

fix: make use of sshd_config.d and sysctl.d (#234)

chore: update system requirement information in README

sync from upstream, version bump

fix: phpstan config for optional path

chore: upgrade deps

fix: using new Resilio Sync configuration file and systemd unit

chore: fix linting issues and upgrade dependencies

chore: fix linting issues