Bump xunit.v3 from 3.1.0 to 3.2.1

---
updated-dependencies:
- dependency-name: xunit.v3
  dependency-version: 3.2.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

tests/LinkDotNet.StringBuilder.UnitTests/LinkDotNet.StringBuilder.UnitTests.csproj

@@ -11,7 +11,7 @@
     <ItemGroup>
         <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.0.0" />
         <PackageReference Include="Shouldly" Version="4.3.0" />
-        <PackageReference Include="xunit.v3" Version="3.1.0" />
+        <PackageReference Include="xunit.v3" Version="3.2.1" />
         <PackageReference Include="xunit.runner.visualstudio" Version="3.1.5">
             <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
             <PrivateAssets>all</PrivateAssets>