Update redis connection docs to match latest Keyv API

[tninesling]

The @apollo/utils.keyvadapter package was updated in apollographql/apollo-utils#461 to be compatible with Keyv v5. The primary change is that the Keyv constructor takes a store instead of a string.

The constructor can be invoked in two ways:

// passed as first argument
new Keyv(new KeyvRedis("redis://..."))

// passed as store
new Keyv({ store: new KeyvRedis("redis://...") })

This updates the Redis examples in the documentation to match the new API. For simplicity, I've stuck to the first format.

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Configuration

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        "repo": "apollo-server",
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Name	Link
Commit	92a459d
Preview	https://www.apollographql.com/docs/deploy-preview/187a5bf8c3022ea0cf68
Build ID	187a5bf8c3022ea0cf68
File Changes	0 new, 7 changed, 0 removed * (developer-tools)/apollo-server/(latest)/performance/cache-backends.mdx * graphos/reference/router/telemetry/instrumentation/standard-instruments.mdx * graphos/reference/router/telemetry/instrumentation/selectors.mdx * graphos/reference/router/rhai.mdx * graphos/reference/router/federation-version-support.mdx * graphos/reference/router/configuration.mdx * graphos/routing/customization/coprocessor.mdx
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[glasser]

Not an expert on the API changes but it looks like this matches the README on @keyv/redis.