Update spec hashes to be calculated during tests

Kube 1.34 updated the creationTimestamp field to be omitzero, which
means that a null value will not be output at all. Before, the field
would be serialized as `creationTimestamp = null`.

This change meant that the serialization that we generate our hashes
from changed.

In practice this field should never be unset, but we're updating the
tests to remove hard-coded values anyway.

Signed-off-by: Nolan Brubaker <[email protected]>

Author: nrb