Notable PRs in this milestone: https://github.com/shouldly/shouldly/pulls?q=is%3Apr+is%3Aclosed+milestone%3A4.3.0

What's Changed

• remove some obsoletes by @SimonCropp in #931
• Add support for ImmutableArray for ShouldBeEquivalentTo by @larsiver in #930
• update sdk to 8.0.301 by @SimonCropp in #942
• sdk 8.0.302 by @SimonCropp in #943
• remove sourcelink by @SimonCropp in #944
• move tests projects to net8 by @SimonCropp in #947
• update MarkdownSnippets by @SimonCropp in #949
• update PublicApiGenerator by @SimonCropp in #950
• update Microsoft.NET.Test.Sdk by @SimonCropp in #951
• update Microsoft.CodeAnalysis.CSharp by @SimonCropp in #952
• Improve some of the flaky tests by @slang25 in #954
• avoid task waiting in ShouldCompleteInTests by @SimonCropp in #945
• update xunit by @SimonCropp in #946
• Extend timeout for CI by @slang25 in #961
• Assortment of Minor Improvements by @slang25 in #962
• Switch from AppVeyor to GitHub Actions by @slang25 in #965
• update xunit 2.9 by @SimonCropp in #966
• sdk 8.0.303 by @SimonCropp in #968
• Fix name allBe.md by @bas-mulder in #972
• Support IReadOnlyDictionary<K, V> by @martincostello in #984
• Drop .NET 5 and add .NET 8 by @martincostello in #997
• Removing previous maintainers in README to avoid confusion/spam by @slang25 in #1032
• fix descriminate -> discriminate by @CaringDev in #1038
• move to stable net9 sdk 9.0.102 by @SimonCropp in #1039
• remove redundant verbatum strings by @SimonCropp in #1042
• fix docs snippets by @SimonCropp in #1040
• remove appveyor.yml from sln by @SimonCropp in #1041
• Add NRT annotation to ShouldBeAssignableTo by @Shane32 in #933
• fix PackageLicenseExpression in nuget by @SimonCropp in #1043
• fix link and add license name license.txt by @SimonCropp in #1044
• Add xunit v3 marker interfaces by @slang25 in #1045
• Fix handling of zero tolerances by @martincostello in #1049
• Housekeeping changes by @slang25 in #1052
• Add a git-blame-ignore-revs file by @slang25 in #1053
• Support Nullable in ShouldBeAssignableTo by @slang25 in #1054
• Relax missing actual argument expression by @slang25 in #1056
• Many dependabot updates

New Contributors

• @larsiver made their first contribution in #930
• @bas-mulder made their first contribution in #972
• @CaringDev made their first contribution in #1038
• @Shane32 made their first contribution in #933

Full Changelog: 4.2.1...4.3.0