Bump DiffEngine from 6.8.1 to 6.8.2 (#541)

Bumps [DiffEngine](https://github.com/VerifyTests/DiffEngine) from 6.8.1 to 6.8.2.
- [Release notes](https://github.com/VerifyTests/DiffEngine/releases)
- [Commits](VerifyTests/DiffEngine@6.8.1...6.8.2)

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

Signed-off-by: dependabot[bot] <[email protected]>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

src/ApprovalTests/ApprovalTests.csproj

@@ -9,7 +9,7 @@
   </PropertyGroup>
   <ItemGroup>
     <Compile Include="..\ApprovalUtilities\InternalsVisibleTo.cs" Link="InternalsVisibleTo.cs" />
-    <PackageReference Include="DiffEngine" Version="6.8.1" />
+    <PackageReference Include="DiffEngine" Version="6.8.2" />
     <PackageReference Include="EmptyFiles" Version="2.7.0" PrivateAssets="None" />
     <PackageReference Include="Fody" Version="6.5.1" PrivateAssets="all" />
     <PackageReference Include="Microsoft.Win32.Registry" Version="5.0.0" />