chore(deps): update dependency diffengine to v18 (#432)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

src/Directory.Packages.props

@@ -18,7 +18,7 @@
 		<PackageVersion Include="NUnit3TestAdapter" Version="5.2.0" />
 		<PackageVersion Include="NUnit.Analyzers" Version="4.11.2" />
 		<PackageVersion Include="Shouldly" Version="4.3.0" />
-		<PackageVersion Include="DiffEngine" Version="17.0.2" />
+		<PackageVersion Include="DiffEngine" Version="18.0.0" />
 		<PackageVersion Include="coverlet.msbuild" Version="6.0.4" />
 	</ItemGroup>
 </Project>