build(deps): Bump AngleSharp.Diffing from 0.17.1 to 0.18.1

Bumps [AngleSharp.Diffing](https://github.com/AngleSharp/AngleSharp.Diffing) from 0.17.1 to 0.18.1.
- [Release notes](https://github.com/AngleSharp/AngleSharp.Diffing/releases)
- [Changelog](https://github.com/AngleSharp/AngleSharp.Diffing/blob/devel/CHANGELOG.md)
- [Commits](AngleSharp/AngleSharp.Diffing@v0.17.1...v0.18.1)

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

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

Author: dependabot[bot]

src/bunit.web/bunit.web.csproj

@@ -16,7 +16,7 @@
 
 	<ItemGroup>
 		<PackageReference Include="AngleSharp" Version="0.17.1" />
-		<PackageReference Include="AngleSharp.Diffing" Version="0.17.1" />
+		<PackageReference Include="AngleSharp.Diffing" Version="0.18.1" />
 	</ItemGroup>
 
 	<ItemGroup Condition="'$(TargetFramework)' == 'netstandard2.1'">