build(deps-dev): update diff-cover requirement from <8.1 to <9.1

[dependabot[bot]]

Updates the requirements on diff-cover to permit the latest version.

Release notes

Sourced from diff-cover's releases.

9.0.0

What's Changed

• Add line numbers to Markdown code snippets by @​walles in Bachmann1234/diff_cover#399

Dependency bumps

• Bump pluggy from 1.3.0 to 1.4.0 by @​dependabot in Bachmann1234/diff_cover#390
• Bump actions/cache from 3 to 4 by @​dependabot in Bachmann1234/diff_cover#389
• Bump black from 23.12.1 to 24.1.1 by @​dependabot in Bachmann1234/diff_cover#391
• Bump pylint from 3.0.3 to 3.1.0 by @​dependabot in Bachmann1234/diff_cover#393
• Bump black from 24.1.1 to 24.2.0 by @​dependabot in Bachmann1234/diff_cover#392
• Bump black from 24.2.0 to 24.3.0 by @​dependabot in Bachmann1234/diff_cover#395
• Bump pytest-mock from 3.12.0 to 3.14.0 by @​dependabot in Bachmann1234/diff_cover#396
• Bump pytest-cov from 4.1.0 to 5.0.0 by @​dependabot in Bachmann1234/diff_cover#397

New Contributors

• @​walles made their first contribution in Bachmann1234/diff_cover#399

Full Changelog: https://github.com/Bachmann1234/diff_cover/compare/v8.0.3...v9.0.0

Commits

• 3fdb5f4 Version 9.0.0
• 411c5ff Add line numbers to Markdown code snippets (#399)
• 98df742 Bump pytest-cov from 4.1.0 to 5.0.0 (#397)
• 12c563d Bump pytest-mock from 3.12.0 to 3.14.0 (#396)
• a2aa5f6 Bump black from 24.2.0 to 24.3.0 (#395)
• 8824a19 Bump black from 24.1.1 to 24.2.0 (#392)
• 8516595 Bump pylint from 3.0.3 to 3.1.0 (#393)
• c9a79de Bump black from 23.12.1 to 24.1.1 (#391)
• 2daddab Bump actions/cache from 3 to 4 (#389)
• 25e2f3a Bump pluggy from 1.3.0 to 1.4.0 (#390)
• Additional commits viewable in compare view

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[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 83.35%. Comparing base (4725637) to head (6ee78a8).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #816 +/- ## ======================================= Coverage 83.35% 83.35% ======================================= Files 22 22 Lines 4818 4818 Branches 1303 1303 ======================================= Hits 4016 4016 Misses 527 527 Partials 275 275 ```

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