Update the requirements throughout the project to be in sync and to
reflect the current state of dependencies.
Signed-off-by: Felix Matouschek <fmatouschek@redhat.com>
This adds yamllint to the CI linter job and sets the maximum line
length to 140 like in kubevirt/kubevirt.
Signed-off-by: Felix Matouschek <fmatouschek@redhat.com>