chore(deps): update dependency stackexchange.redis to 2.8.16

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
StackExchange.Redis (source)	2.8.14 -> 2.8.16

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Release Notes

StackExchange/StackExchange.Redis (StackExchange.Redis)

### [`v2.8.16`](https://redirect.github.com/StackExchange/StackExchange.Redis/releases/tag/2.8.16) [Compare Source](https://redirect.github.com/StackExchange/StackExchange.Redis/compare/2.8.14...2.8.16) #### What's Changed - Fix: PhysicalBridge: Always perform "last read" check in heartbeat when `HeartbeatConsistencyChecks` is enabled ([#​2795](https://redirect.github.com/StackExchange/StackExchange.Redis/issues/2795) by [@​NickCraver](https://redirect.github.com/NickCraver)) **Full Changelog**: https://github.com/StackExchange/StackExchange.Redis/compare/2.8.14...2.8.16

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