Update ioredis requirement from ^4.19.2 to ^4.27.8

[dependabot[bot]]

Updates the requirements on ioredis to permit the latest version.

Release notes

Sourced from ioredis's releases.

v4.27.8

4.27.8 (2021-08-18)

Bug Fixes

• handle malicious keys for hgetall (#1416) (7d73b9d), closes #1267

Changelog

Sourced from ioredis's changelog.

4.27.8 (2021-08-18)

Bug Fixes

• handle malicious keys for hgetall (#1416) (7d73b9d), closes #1267

4.27.7 (2021-08-01)

Bug Fixes

• cluster: fix autopipeline with keyPrefix or arg array (#1391) (d7477aa), closes #1264 #1248 #1392

4.27.6 (2021-06-13)

Bug Fixes

• fixed autopipeline performances. (#1226) (42f1ee1)

4.27.5 (2021-06-05)

Bug Fixes

• SENTINEL: actively failover detection under an option (#1363) (f02e383)

4.27.4 (2021-06-04)

Performance Improvements

• Serialize error stack only when needed (#1359) (62b6a64)

4.27.3 (2021-05-22)

Bug Fixes

• autopipeling for buffer function (#1231) (abd9a82)

4.27.2 (2021-05-04)

Bug Fixes

• cluster: avoid ClusterAllFailedError in certain cases (aa9c5b1), closes #1330

4.27.1 (2021-04-24)

... (truncated)

Commits

• 0587353 chore(release): 4.27.8 [skip ci]
• 7d73b9d fix: handle malicious keys for hgetall (#1416)
• 17c7595 chore: fix potential security vulnerabilities [skip ci]
• a13eddc chore(release): 4.27.7 [skip ci]
• d7477aa fix(cluster): fix autopipeline with keyPrefix or arg array (#1391)
• beefcc1 docs(README): fix docs typo (#1385)
• cae7fc5 chore(release): 4.27.6 [skip ci]
• 42f1ee1 fix: fixed autopipeline performances. (#1226)
• 71f2994 chore(release): 4.27.5 [skip ci]
• f02e383 fix(SENTINEL): actively failover detection under an option (#1363)
• Additional commits viewable in compare view

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