[CentOS-mirror] Change IP in ACL for centos.mirrors.ovh.net

[Felix Krohn]

Good morning,

I'm preparing to move our CentOS mirror (centos.mirrors.ovh.net) to
another hardware. This will not change the mirror's name or other specs,
just the source IP used for rync:

current src IP:	91.121.124.139 / 2001:41d0:1:7b8b::1
future src IP:	91.121.188.201 / 2001:41d0:1:bfc9::1

Could you please adapt the ACL accordingly?
Bonus would be to leave both IPs in for a bit so that I can switch over
when all tests are successful.

Best regards,
Felix Krohn