fix(deps): update dependency ioredis to v4.20.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
ioredis	4.19.4 -> 4.20.0

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Release Notes

luin/ioredis

v4.20.0

Compare Source

Features

• support username in URI (#​1284) (cbc5421)

4.19.5 (2021-01-14)

Bug Fixes

• password contains colons (#​1274) (37c6daf)

4.19.4 (2020-12-13)

Bug Fixes

• prevent duplicate intervals being set. (#​1244) (515d9ea), closes #​1232 #​1226 #​1232 /github.com/luin/ioredis/blob/v4.19.2/lib/cluster/index.ts#L311-L313

4.19.3 (2020-12-13)

Bug Fixes

• auth command should be not allowed in auto pipeline. (#​1242) (bafdd4b)

4.19.2 (2020-10-31)

Bug Fixes

• Fix autopipeline and downgrade p-map to support Node 6. [#​1216](https://togithub.com/The dependencie 'p-map' require node >= 10 redis/ioredis#1216)

4.19.1 (2020-10-28)

Bug Fixes

• Make sure script caches interval is cleared. [#​1215](https://togithub.com/_addedScriptHashesCleanInterval is not always cleared on redis.quit() redis/ioredis#1215)

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