Update Helm release redis to ~20.6.0

[renovate]

This PR contains the following updates:

Package	Update	Change
redis (source)	minor	~20.4.0 -> ~20.6.0

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Release Notes

bitnami/charts (redis)

v20.6.0

• [bitname/redis] Add support for master and replicas resources to be annotated (#​31034)

v20.5.0

• [bitnami/redis] Detect non-standard images (#​30942)

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