build(deps): Bump xunit.assert from 2.5.3 to 2.6.0

Bumps [xunit.assert](https://github.com/xunit/xunit) from 2.5.3 to 2.6.0.
- [Commits](xunit/xunit@2.5.3...2.6.0)

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

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

Author: dependabot[bot]

tests/bunit.testassets/bunit.testassets.csproj

@@ -17,7 +17,7 @@
 		<PackageReference Include="Serilog.Expressions" Version="3.4.1" />
 		<PackageReference Include="xunit.extensibility.execution" Version="2.5.2" />
 		<PackageReference Include="xunit.abstractions" Version="2.0.3" />
-		<PackageReference Include="xunit.assert" Version="2.5.3" />
+		<PackageReference Include="xunit.assert" Version="2.6.0" />
 	</ItemGroup>
 
 	<ItemGroup Condition="'$(TargetFramework)' == 'netstandard2.1'">