chore(deps): update redis docker tag to v20.9.0

This MR contains the following updates:

Package	Type	Update	Change
redis (source)	HelmChart	minor	20.8.0 -> 20.9.0

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Release Notes

bitnami/charts (redis)

v20.9.0

• [bitnami/redis] Add ACL Authentication for Sentinel Nodes (#​31974)

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