i3: debian.sur5r.net is down again - can't update my system

I’m submitting a…

[x] Other (Please describe in detail)

Current Behavior

It already happened in #2713.

Err:93 http://debian.sur5r.net/i3 bionic/universe amd64 i3lock amd64 2.11-1~~bionic1                                                                                                                                                        
  Could not connect to debian.sur5r.net:80 (46.237.250.143). - connect (111: Connection refused) Could not connect to debian.sur5r.net:80 (2001:470:9e42:0:221:5eff:fe56:cdba), connection timed out
...
Err:1 http://debian.sur5r.net/i3 bionic/universe amd64 i3lock amd64 2.11-1~~bionic1                                                                                                                                                         
  Could not connect to debian.sur5r.net:80 (46.237.250.143). - connect (111: Connection refused) Could not connect to debian.sur5r.net:80 (2001:470:9e42:0:221:5eff:fe56:cdba), connection timed out
E: Failed to fetch http://debian.sur5r.net/i3/pool/universe/i/i3lock/i3lock_2.11-1~~bionic1_amd64.deb  Could not connect to debian.sur5r.net:80 (46.237.250.143). - connect (111: Connection refused) Could not connect to debian.sur5r.net:80 (2001:470:9e42:0:221:5eff:fe56:cdba), connection timed out
E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?

Reproduction Instructions

apt update
apt upgrade