Bump DiffEngine from 12.2.1 to 12.3.0 (#726)

Bumps [DiffEngine](https://github.com/VerifyTests/DiffEngine) from 12.2.1 to 12.3.0.
- [Release notes](https://github.com/VerifyTests/DiffEngine/releases)
- [Commits](https://github.com/VerifyTests/DiffEngine/commits/12.3.0)

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

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

src/ApprovalTests/ApprovalTests.csproj

@@ -11,7 +11,7 @@
     <Using Remove="System.Net.Http" />
     <PackageReference Include="Polyfill" Version="1.28.0" PrivateAssets="all" />
     <Compile Include="..\ApprovalUtilities\InternalsVisibleTo.cs" Link="InternalsVisibleTo.cs" />
-    <PackageReference Include="DiffEngine" Version="12.2.1" />
+    <PackageReference Include="DiffEngine" Version="12.3.0" />
     <PackageReference Include="EmptyFiles" Version="4.5.1" PrivateAssets="None" />
     <PackageReference Include="Fody" Version="6.8.0" PrivateAssets="all" />
     <PackageReference Include="Microsoft.Win32.Registry" Version="5.0.0" />