Bump Verify.NUnit from 26.5.0 to 26.6.0 in /src

Bumps [Verify.NUnit](https://github.com/VerifyTests/Verify) from 26.5.0 to 26.6.0.
- [Release notes](https://github.com/VerifyTests/Verify/releases)
- [Commits](VerifyTests/Verify@26.5.0...26.6.0)

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

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

src/Orc.FileSystem.Tests/Orc.FileSystem.Tests.csproj

@@ -25,7 +25,7 @@
  <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
  </PackageReference>
  <PackageReference Include="PublicApiGenerator" Version="11.1.0" PrivateAssets="all" />
- <PackageReference Include="Verify.NUnit" Version="26.5.0" />
+ <PackageReference Include="Verify.NUnit" Version="26.6.0" />
  </ItemGroup>
 
  <ItemGroup>