README: Bump Debian onion to v3

Author: JeremyRand

README.md

@@ -309,7 +309,7 @@ To begin with:
 
 You can use the environment variable `PRAWNOS_SUITE` to use a Debian suite other than `Bullseye`.  For example, to use Debian sid, you can build with `sudo PRAWNOS_SUITE=sid make image`
 
-You can use the environment variable `PRAWNOS_DEBOOTSTRAP_MIRROR` to use a non-default Debian mirror with debootstrap.  For example, to use [Debian's Tor onion service mirror](https://onion.debian.org/) with debootstrap, you can build with `sudo PRAWNOS_DEBOOTSTRAP_MIRROR=http://vwakviie2ienjx6t.onion/debian make image`.
+You can use the environment variable `PRAWNOS_DEBOOTSTRAP_MIRROR` to use a non-default Debian mirror with debootstrap.  For example, to use [Debian's Tor onion service mirror](https://onion.debian.org/) with debootstrap, you can build with `sudo PRAWNOS_DEBOOTSTRAP_MIRROR=http://2s4yqjx5ul6okpp3f2gaunr2syex5jgbfpfvhxxbbjwnrsvbk5v3qbid.onion/debian make image`.
 
 
 ### Crossystem / mosys