[cinder-csi-plugin] [manila-csi-plugin] Update Cinder and Manila CSI charts maintainers

[dulek]

What this PR does / why we need it:

The GitHub account @brtknr does not exist anymore and our chart linter complains about this. This commit adds me as the maintainer.

Which issue this PR fixes(if applicable): fixes #2582

Special notes for reviewers:

Release note:

Maintainer for Cinder and Manila CSI charts is updated.

[dulek]

/hold

It's a terrible idea to add me, we don't use Helm in our products, so this is looking for a better maintainer candidate.

[jichenjc]

/lgtm

[mnasiadka]

/lgtm

[k8s-ci-robot]

@mnasiadka: changing LGTM is restricted to collaborators

In response to [this](https://github.com/kubernetes/cloud-provider-openstack/pull/2583#issuecomment-2076540948): >/lgtm Instructions for interacting with me using PR comments are available [here](https://git.k8s.io/community/contributors/guide/pull-requests.md). If you have questions or suggestions related to my behavior, please file an issue against the [kubernetes/test-infra](https://github.com/kubernetes/test-infra/issues/new?title=Prow%20issue:) repository.

[dulek]

/hold cancel

[zetaab]

/approve

[k8s-ci-robot]

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[zetaab]

/lgtm