cinder-csi-plugin] [manila-csi-plugin] Cinder and Manila CSI charts linting fails because @brtknr is no longer a GitHub account

[Michal Dulko]

Is this a BUG REPORT or FEATURE REQUEST?:

/kind bug

What happened:

 ✖︎ openstack-cinder-csi => (version: "2.29.1", path: "charts/cinder-csi-plugin") > failed validating maintainer "brtknr": 404 Not Found

What you expected to happen:
Job to succeed.

How to reproduce it:
#2578

Anything else we need to know?:

Environment:

• openstack-cloud-controller-manager(or other related binary) version:
• OpenStack version:
• Others: