Move CI to use EOS 5.3.*
At the time of writing, the latest EOS tag is 5.3.9. As we are planning to move our production instances to EOS 5.3 soon, the CI should be updated accordingly.
At the time of writing, the latest EOS tag is 5.3.9. As we are planning to move our production instances to EOS 5.3 soon, the CI should be updated accordingly.