Update redis Docker tag to v20.7.1

This MR contains the following updates:

Package	Type	Update	Change
redis (source)	HelmChart	patch	20.7.0 -> 20.7.1

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Release Notes

bitnami/charts (redis)

v20.7.1

• [bitnami/*] Use CDN url for the Bitnami Application Icons (#​31881) (d9bb11a), closes #​31881
• [bitnami/redis] Release 20.7.1 (#​31943) (e82cc74), closes #​31943

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