Define svix library's version
Related to swh/infra/sysadm-environment#5314 (closed)
Add the svix library version to the requirements.txt file to make sure it matches the svix-server version.
Staging instance, all changes can be removed at any time
Related to swh/infra/sysadm-environment#5314 (closed)
Add the svix library version to the requirements.txt file to make sure it matches the svix-server version.