Update ioredis requirement from ^4.19.2 to ^4.27.5

[dependabot-preview[bot]]

Updates the requirements on ioredis to permit the latest version.

Release notes

Sourced from ioredis's releases.

v4.27.5

4.27.5 (2021-06-05)

Bug Fixes

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

Changelog

Sourced from ioredis's changelog.

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)

Bug Fixes

• clears commandTimeout timer as each respective command gets fulfilled (#1336) (d65f8b2)

4.27.0 (2021-04-24)

Features

• sentinel: detect failover from +switch-master messages (#1328) (a464151)

4.26.0 (2021-04-08)

Bug Fixes

• cluster: subscriber connection leaks (81b9be0), closes #1325

... (truncated)

Commits

• 71f2994 chore(release): 4.27.5 [skip ci]
• f02e383 fix(SENTINEL): actively failover detection under an option (#1363)
• c87ea2a chore(release): 4.27.4 [skip ci]
• 62b6a64 perf: Serialize error stack only when needed (#1359)
• d4a55b5 chore(release): 4.27.3 [skip ci]
• abd9a82 fix: autopipeling for buffer function (#1231)
• e0cfea1 chore(release): 4.27.2 [skip ci]
• aa9c5b1 fix(cluster): avoid ClusterAllFailedError in certain cases
• aafc349 chore(release): 4.27.1 [skip ci]
• d65f8b2 fix: clears commandTimeout timer as each respective command gets fulfilled (#...
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[dependabot-preview[bot]]

Superseded by #124.