deps: update libflate requirement from 1.0.0 to 2.1.0

[dependabot[bot]]

Updates the requirements on libflate to permit the latest version.

Release notes

Sourced from libflate's releases.

v2.1.0

What's Changed

• Update hashbrown to 0.14 by @​torokati44 in sile/libflate#76
• Update clap to v4 by @​sile in sile/libflate#77

New Contributors

• @​torokati44 made their first contribution in sile/libflate#76

Full Changelog: https://github.com/sile/libflate/compare/2.0.0...2.1.0

Commits

• 6676d36 Bump version to 2.1.0
• 04565c3 Merge pull request #77 from sile/update-clap
• 192980e Update Cargo.toml
• a424630 Update clap to v4
• 27628cb Merge pull request #76 from torokati44/hashbrown-0.14
• d37f049 Update hashbrown to 0.14
• 40d8260 Fix broken tests
• 7aba1f6 Update Cargo.toml
• 015cf03 Update Cargo.toml
• cc398ea Update edition to 2021
• Additional commits viewable in compare view

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[mulimoen]

@dependabot rebase

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