Bump dask from 0.17.2 to 2021.10.0

[dependabot[bot]]

Bumps dask from 0.17.2 to 2021.10.0.

Commits

• 97494ff bump version to 2021.10.0
• ac01ddc da.store to create well-formed HighLevelGraph (#8261)
• 9f0f002 CI: force nightly pyarrow in the upstream build (#8281)
• a544670 Remove chest (#8279)
• 6dbf095 Skip doctests if optional dependencies are not installed (#8258)
• f424669 Update tmpdir and tmpfile context manager docstrings (#8270)
• 5b63301 Unregister callbacks in doctests (#8276)
• 38fbcf1 Fix typo in docs (#8277)
• 98fed9b Stale label github action (#8244)
• 7b1f306 Client-shutdown method appears twice (#8273)
• Additional commits viewable in compare view

Dependabot will resolve any conflicts with this PR as long as you don't alter it yourself. You can also trigger a rebase manually by commenting @dependabot rebase.

---

Dependabot commands and options

You can trigger Dependabot actions by commenting on this PR:

• @dependabot rebase will rebase this PR
• @dependabot recreate will recreate this PR, overwriting any edits that have been made to it
• @dependabot merge will merge this PR after your CI passes on it
• @dependabot squash and merge will squash and merge this PR after your CI passes on it
• @dependabot cancel merge will cancel a previously requested merge and block automerging
• @dependabot reopen will reopen this PR if it is closed
• @dependabot close will close this PR and stop Dependabot recreating it. You can achieve the same result by closing it manually
• @dependabot ignore this major version will close this PR and stop Dependabot creating any more for this major version (unless you reopen the PR or upgrade to it yourself)
• @dependabot ignore this minor version will close this PR and stop Dependabot creating any more for this minor version (unless you reopen the PR or upgrade to it yourself)
• @dependabot ignore this dependency will close this PR and stop Dependabot creating any more for this dependency (unless you reopen the PR or upgrade to it yourself)
• @dependabot use these labels will set the current labels as the default for future PRs for this repo and language
• @dependabot use these reviewers will set the current reviewers as the default for future PRs for this repo and language
• @dependabot use these assignees will set the current assignees as the default for future PRs for this repo and language
• @dependabot use this milestone will set the current milestone as the default for future PRs for this repo and language

You can disable automated security fix PRs for this repo from the Security Alerts page.