Upgrade VAST COSI Driver

Complete these steps to upgrade VAST COSI Driver:

Refresh Helm repository information to see which VAST COSI Driver versions are available for deployment:
```
helm repo update
```

Update the VAST COSI Driver's Helm chart configuration file (values.yaml) to specify the target release of VAST COSI Driver:

image:
                        csiVastPlugin:
                        repository: <repo>
                        tag: <new release>
                        imagePullPolicy: IfNotPresent

Where:

<repo> is the name of the VAST COSI Driver Helm repository.
<new release> is the VAST COSI Driver release to be upgraded to.

For example:

image:
                        csiVastPlugin:
                        repository: vastdataorg/csi
                        tag: v2.6.0
                        imagePullPolicy: IfNotPresent

Run Helm upgrade:
```
helm upgrade <old release> <repo>/vastcosi -f <filename>.yaml
```
Where:
- <old release> is the VAST COSI Driver release to be upgraded from.
- <repo> is the name of the VAST COSI Driver Helm repository.
- vastcosi is the name of the VAST COSI Driver Helm chart.
- <filename>.yaml is the Helm chart configuration file.
Verify the status of the new VAST COSI Driver chart release:
```
helm ls
```