Bump DiffEngine from 18.4.1 to 18.4.2

---
updated-dependencies:
- dependency-name: DiffEngine
  dependency-version: 18.4.2
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

src/Directory.Packages.props

@@ -20,7 +20,7 @@
     <PackageVersion Include="Verify.NUnit" Version="31.13.1" />
     <PackageVersion Include="Microsoft.Sbom.Targets" Version="4.1.5" />
     <PackageVersion Include="Argon" Version="0.33.5" />
-    <PackageVersion Include="DiffEngine" Version="18.4.1" />
+    <PackageVersion Include="DiffEngine" Version="18.4.2" />
     <PackageVersion Include="EmptyFiles" Version="8.17.2" />
     <PackageVersion Include="SimpleInfoName" Version="3.2.0" />
   </ItemGroup>