Rook supports six versions of kubernetes but we only want to spend CI
resources for testing four of them.
In order to align with this commitment, this change lets rook run
integration test suites on kubernetes v1.34 instead of v1.33 for release
testing.
As a result, the latest patch releases of kubernetes v1.31, v1.32,
v1.34, and v1.35 are tested for rook releases.
In addition, k8s version specification is made more systematic to
use the pattern v1.3X.Y instead of 1.3X.Y.
Signed-off-by: Michael Adam <obnox@samba.org>