This patch updates the RedisFailover Helm template to use a newer,
secure Redis version (8.2.0). This addresses known security issues in
the previous Redis version and ensures safer deployments.
```release-note
[redis] Upgrade Redis to a secure version (8.2.0) to fix security vulnerabilities.
```
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## What this PR does
### Release note
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## Summary by CodeRabbit
* **New Features**
* Redis deployments can now specify the container image via a new
configurable value (default: redis:8.2.0), allowing easy override of the
Redis image used.
* **Schema**
* Values schema and resource definition schemas updated to include and
validate the new image setting.
* **Documentation**
* README updated to document the new image parameter.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
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