Bump Verify.DiffPlex from 2.3.0 to 3.0.0 in /src (#469)

Bumps [Verify.DiffPlex](https://github.com/VerifyTests/Verify.DiffPlex) from 2.3.0 to 3.0.0.
- [Release notes](https://github.com/VerifyTests/Verify.DiffPlex/releases)
- [Commits](VerifyTests/Verify.DiffPlex@2.3.0...3.0.0)

---
updated-dependencies:
- dependency-name: Verify.DiffPlex
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

src/DiffEngineTray.Tests/DiffEngineTray.Tests.csproj

@@ -8,7 +8,7 @@
     <Using Include="DiffEngine" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.9.0" />
     <PackageReference Include="Argon" Version="0.17.0" />
-    <PackageReference Include="Verify.DiffPlex" Version="2.3.0" />
+    <PackageReference Include="Verify.DiffPlex" Version="3.0.0" />
     <PackageReference Include="Verify.WinForms" Version="4.0.0" />
     <PackageReference Include="Verify.Xunit" Version="23.7.2" />
     <PackageReference Include="Verify.ImageMagick" Version="3.3.0" />