chore(deps): update dependency diff-cover to v9

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
diff-cover	^8.0.0 -> ^9.0.0

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Release Notes

Bachmann1234/diff-cover (diff-cover)

### [`v9.0.0`](https://togithub.com/Bachmann1234/diff_cover/releases/tag/v9.0.0): 9.0.0 [Compare Source](https://togithub.com/Bachmann1234/diff-cover/compare/v8.0.3...v9.0.0) #### What's Changed - Add line numbers to Markdown code snippets by [@​walles](https://togithub.com/walles) in [https://github.com/Bachmann1234/diff_cover/pull/399](https://togithub.com/Bachmann1234/diff_cover/pull/399) ##### Dependency bumps - Bump pluggy from 1.3.0 to 1.4.0 by [@​dependabot](https://togithub.com/dependabot) in [https://github.com/Bachmann1234/diff_cover/pull/390](https://togithub.com/Bachmann1234/diff_cover/pull/390) - Bump actions/cache from 3 to 4 by [@​dependabot](https://togithub.com/dependabot) in [https://github.com/Bachmann1234/diff_cover/pull/389](https://togithub.com/Bachmann1234/diff_cover/pull/389) - Bump black from 23.12.1 to 24.1.1 by [@​dependabot](https://togithub.com/dependabot) in [https://github.com/Bachmann1234/diff_cover/pull/391](https://togithub.com/Bachmann1234/diff_cover/pull/391) - Bump pylint from 3.0.3 to 3.1.0 by [@​dependabot](https://togithub.com/dependabot) in [https://github.com/Bachmann1234/diff_cover/pull/393](https://togithub.com/Bachmann1234/diff_cover/pull/393) - Bump black from 24.1.1 to 24.2.0 by [@​dependabot](https://togithub.com/dependabot) in [https://github.com/Bachmann1234/diff_cover/pull/392](https://togithub.com/Bachmann1234/diff_cover/pull/392) - Bump black from 24.2.0 to 24.3.0 by [@​dependabot](https://togithub.com/dependabot) in [https://github.com/Bachmann1234/diff_cover/pull/395](https://togithub.com/Bachmann1234/diff_cover/pull/395) - Bump pytest-mock from 3.12.0 to 3.14.0 by [@​dependabot](https://togithub.com/dependabot) in [https://github.com/Bachmann1234/diff_cover/pull/396](https://togithub.com/Bachmann1234/diff_cover/pull/396) - Bump pytest-cov from 4.1.0 to 5.0.0 by [@​dependabot](https://togithub.com/dependabot) in [https://github.com/Bachmann1234/diff_cover/pull/397](https://togithub.com/Bachmann1234/diff_cover/pull/397) #### New Contributors - [@​walles](https://togithub.com/walles) made their first contribution in [https://github.com/Bachmann1234/diff_cover/pull/399](https://togithub.com/Bachmann1234/diff_cover/pull/399) **Full Changelog**: https://github.com/Bachmann1234/diff_cover/compare/v8.0.3...v9.0.0

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Build succeeded. https://fedora.softwarefactory-project.io/zuul/buildset/8823ec93d25d49fbbd5ce2966f61ab96

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