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### Description of the change
Migrates from Redis to Valkey.
### Benefits
The Redis License is changing from BSD-3-Clause to RSALv2 and SSPLv1 which are not open source under the OSI definition. We should consider open-source alternatives as a default replacement for Redis.
### Possible drawbacks
Large scale change, potentially breaking.
### Applicable issues
https://github.com/go-gitea/gitea/issues/32056
### ⚠ BREAKING
Major version change, redis provider changed to valkey.
### Checklist
<!-- [Place an '[X]' (no spaces) in all applicable fields. Please remove unrelated fields.] -->
- [X] Parameters are documented in the `values.yaml` and added to the `README.md` using [readme-generator-for-helm](https://github.com/bitnami-labs/readme-generator-for-helm)
- [X] Breaking changes are documented in the `README.md`
- [X] Helm templating unittests are added (required when changing anything in `templates` folder)
Co-authored-by: pat-s <patrick.schratz@gmail.com>
Reviewed-on: https://gitea.com/gitea/helm-gitea/pulls/775
Reviewed-by: pat-s <pat-s@noreply.gitea.com>
Co-authored-by: Sean Teo <sawntoe@gmail.com>
Co-committed-by: Sean Teo <sawntoe@gmail.com>
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