chore(deps): update redis docker tag to v19.6.4

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This PR contains the following updates:

Package	Update	Change
redis (source)	patch	^19.6.2 -> ^19.6.4

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Release Notes

bitnami/charts (redis)

v19.6.4

• [bitnami/redis] Release 19.6.4 (#​28499)

v19.6.3

• [bitnami/redis] Release 19.6.3 (#​28365)

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