Use .NET 9 SDK

[jnyrup]

This PR updates the minimum required SDK to .NET 9.
While C# 13.0 doesn't seem very interesting for us, .NET 9 SDK still brings a new set of analyzers.

The NET 9.0.200 SDK supports the new slnx format, but unfortunately NUKE cannot parse it.
See nuke-build/nuke#1520

IMPORTANT

• If the PR touches the public API, the changes have been approved in a separate issue with the "api-approved" label.
• The code complies with the Coding Guidelines for C#.
• The changes are covered by unit tests which follow the Arrange-Act-Assert syntax and the naming conventions such as is used in these tests.
• If the PR adds a feature or fixes a bug, please update the release notes with a functional description that explains what the change means to consumers of this library, which are published on the website.
• If the PR changes the public API the changes needs to be included by running AcceptApiChanges.ps1 or AcceptApiChanges.sh.
• If the PR affects the documentation, please include your changes in this pull request so the documentation will appear on the website.
  • Please also run ./build.sh --target spellcheck or .\build.ps1 --target spellcheck before pushing and check the good outcome

CONTRIBUTOR LICENSE GRANT

By submitting this contribution, the contributor hereby irrevocably grants to the project owners and maintainers a perpetual, worldwide, royalty-free, irrevocable license to use, reproduce, modify, distribute, sublicense, and create derivative works of the contribution for any purpose and under any terms, including proprietary licensing.

The contributor waives any moral rights in the contribution to the extent permitted by law and agrees not to assert any claim of authorship or control over the contribution. The contributor represents that they are the sole author of the contribution and that it is provided free of any third-party claims.

The contributor understands and agrees that the maintainers may, at their sole discretion, use, license, or redistribute the contribution as part of any work and under any terms they choose, without further permission or attribution.

• I have read the Contributor License Grant and accept the conditions
• I'm interested in a free license for Fluent Assertions and will share my email address through [email protected]

[coveralls]

Pull Request Test Coverage Report for Build 16089789800

Details

• 4 of 6 (66.67%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.01%) to 97.298%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
Src/FluentAssertions/Common/MethodInfoExtensions.cs	4	6	66.67%

Totals
Change from base Build 16028903471:	-0.01%
Covered Lines:	12546
Relevant Lines:	12748

---

💛 - Coveralls

[github-actions]

Qodana for .NET

It seems all right 👌

No new problems were found according to the checks applied

💡 Qodana analysis was run in the pull request mode: only the changed files were checked
☁️ View the detailed Qodana report

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[dennisdoomen]

Nice work!