Bump xunit from 2.4.2 to 2.5.1

Bumps [xunit](https://github.com/xunit/xunit) from 2.4.2 to 2.5.1.
- [Commits](xunit/xunit@2.4.2...2.5.1)

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

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

tests/Plaid.Tests/Plaid.Tests.csproj

@@ -33,7 +33,7 @@
 
 	<ItemGroup>
 		<PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.7.1" />
-		<PackageReference Include="xunit" Version="2.4.2" />
+		<PackageReference Include="xunit" Version="2.5.1" />
 		<PackageReference Include="xunit.runner.visualstudio" Version="2.4.5">
 			<PrivateAssets>all</PrivateAssets>
 			<IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>