build(deps): bump anyhow from 1.0.80 to 1.0.81

[dependabot[bot]]

Bumps anyhow from 1.0.80 to 1.0.81.

Release notes

Sourced from anyhow's releases.

1.0.81

• Make backtrace support available when using -Dwarnings (#354)

Commits

• 4aad4ed Release 1.0.81
• 8be9091 Merge pull request #354 from dtolnay/deadcode
• a2eb7dd Make compatible with -Dwarnings
• See full diff in compare view

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[dependabot[bot]]

Looks like anyhow is up-to-date now, so this is no longer needed.