fix: update script that fixes the CentOS build

Author: ntamas

scripts/fixup_centos_7_in_ci.sh

@@ -4,3 +4,5 @@
 
 sed -i s/mirror.centos.org/vault.centos.org/g /etc/yum.repos.d/*.repo
 sed -i s/^#.*baseurl=http/baseurl=http/g /etc/yum.repos.d/*.repo
+sed -i s/^mirrorlist=http/#mirrorlist=http/g /etc/yum.repos.d/*.repo
+