samples: update dependency redis to ~4.2.0

[renovate-bot]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
redis	~4.0.0 -> ~4.2.0

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Release Notes

redis/node-redis

### [`v4.2.0`](https://togithub.com/redis/node-redis/releases/tag/redis%404.2.0) [Compare Source](https://togithub.com/redis/node-redis/compare/redis@4.1.1...redis@4.2.0) #### Enhancements - Upgrade `@redis/client` ### [`v4.1.1`](https://togithub.com/redis/node-redis/releases/tag/redis%404.1.1) [Compare Source](https://togithub.com/redis/node-redis/compare/redis@4.1.0...redis@4.1.1) #### Enhancements - Upgrade `@redis/client` ### [`v4.1.0`](https://togithub.com/redis/node-redis/releases/tag/redis%404.1.0) [Compare Source](https://togithub.com/redis/node-redis/compare/redis@4.0.6...redis@4.1.0) #### Enhancements - Upgrade `@redis/bloom` - Upgrade `@redis/client` - Upgrade `@redis/graph` - Upgrade `@redis/json` - Upgrade `@redis/search` - Upgrade `@redis/time-series`

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