Bump distributed from 1.21.6 to 2021.10.0

[dependabot[bot]]

Bumps distributed from 1.21.6 to 2021.10.0.

Commits

• 63ebaea bump version to 2021.10.0
• 1670cf8 Ensure resumed flight tasks are still fetched (#5426)
• cdc68cc AMM high level documentation (#5456)
• 33d83bc Provide stack for suspended coro in test timeout (#5446)
• 918e3fb Handle UCXNotConnected error (#5449)
• 3afc670 AMM: Don't schedule tasks to paused workers (#5431)
• f3aa9d1 Use pip install . instead of calling setup.py (#5442)
• a8151a6 Increase latency for stealing (#5390)
• 1585f85 Type annotations for Worker and gen_cluster (#5438)
• 7d2516a Ensure reconnecting workers do not loose required data (#5436)
• Additional commits viewable in compare view

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