Add updateStrategy for workload manager

[jyje]

To add update strategy, choose key name 'strategy' for 'Deployment/spec.strategy' and 'StatefulSet/spec.updateStrategy'. Update samver from 4.0.6 to 4.1.0 with minor spec changes

[jyje]

Hello, folks. I needed to test rollout-replicas for open-webui. I realized that there is no strategy key for values.yaml and its corresponding template. So I add it and ask PR. Please review this. Any feedback would be welcome

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This pull request includes updates to the open-webui Helm chart, adding a new strategy configuration for updating the workload manager and incrementing the version number. The most important changes include the version bump, updates to the documentation, and the addition of the strategy configuration in the Helm chart templates and values.

Version update:

• charts/open-webui/Chart.yaml: Bumped the chart version from 4.0.6 to 4.1.0.
• charts/open-webui/README.md: Updated the version badge to reflect the new version 4.1.0.

Documentation update:

• charts/open-webui/README.md: Added documentation for the new strategy configuration in the Helm chart.

Helm chart configuration:

• charts/open-webui/templates/workload-manager.yaml: Added conditional logic to include updateStrategy or strategy based on the persistence.enabled value.
• charts/open-webui/values.yaml: Added a new strategy field for configuring the update strategy of the workload manager.