Update dependency redis to v4.6.8

This MR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
redis	4.6.7 -> 4.6.8

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Release Notes

redis/node-redis (redis)

v4.6.8

Compare Source

Enhancements

• upgrade @redis/client from 1.5.8 to 1.5.9
• upgrade @redis/time-series from 1.0.4 to 1.0.5

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