[Onion Services] Update Debian onion site v2 -> v3

Update Debian onion site in featured onions: https://community.torproject.org/onion-services/#featured-onions

5ekxbftvqg26oir5wle3p27ax3wksbxcecnm6oemju7bjra2pn26s3qd.onion

proof: https://onion.debian.org/