[Incubator/Cassandra] Fixes selector missing and update to 3.11.3

[sunng87]

What this PR does / why we need it:
Fixes error that spec.selector was missing from cassandra's statefulset.yml

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[maeb]

This pull request is a duplicate of #7285.

[cpanato]

@sunng87 please rebase and bump the chart version

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[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: sunng87
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[sunng87]

Updated

[MPV]

@cpanato Would be great to get this merged. 😊

[kostyrev]

If it's a duplicate who's gonna win?
There are two PRs resolving the same problem and yet none of them made it to master and we have broken cassandra.

[maver1ck]

@sunng87 This bug was fixed by #8320
Thank you for contibuting.

[sunng87]

OK. Thanks!