fix: update redis docker tag to v20.3.0

[renovate[bot]]

This PR contains the following updates:

Package	Update	Change
redis (source)	minor	20.2.2 -> 20.3.0

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Release Notes

bitnami/charts (redis)

### [`v20.3.0`](https://redirect.github.com/bitnami/charts/blob/HEAD/bitnami/redis/CHANGELOG.md#2030-2024-11-14) - \[bitnami/redis] feat: :sparkles: Allow updating credentials via values.yaml ([#​30452](https://redirect.github.com/bitnami/charts/pull/30452))

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