chore(deployment): remove unused containerPort spec (backport #153)

[mergify]

Related to #140

Descriptions

Removed unused containerPort in Cryostat container's spec. The list is actually immutable but since deployment rollout strategy is Recreate, updating across upgrades is possible.

cryostat-helm/charts/cryostat/templates/deployment.yaml

Line 12 in 4d14d68

type: Recreate

$ oc explain pod.spec.containers.ports
KIND:       Pod
VERSION:    v1

FIELD: ports <[]ContainerPort>

DESCRIPTION:
    List of ports to expose from the container. Not specifying a port here DOES
    NOT prevent that port from being exposed. Any port which is listening on the
    default "0.0.0.0" address inside a container will be accessible from the
    network. Modifying this array with strategic merge patch may corrupt the
    data. For more information See
    https://github.com/kubernetes/kubernetes/issues/108255. Cannot be updated.
    ContainerPort represents a network port in a single container.

```<hr>This is an automatic backport of pull request #153 done by [Mergify](https://mergify.com).