Bump Verify.Xunit from 20.8.2 to 21.0.0 (#367)

Bumps [Verify.Xunit](https://github.com/VerifyTests/Verify) from 20.8.2 to 21.0.0.
- [Release notes](https://github.com/VerifyTests/Verify/releases)
- [Commits](VerifyTests/Verify@20.8.2...21.0.0)

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

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

src/Akka.Hosting.API.Tests/Akka.Hosting.API.Tests.csproj

@@ -18,7 +18,7 @@
             <PrivateAssets>all</PrivateAssets>
         </PackageReference>
         <PackageReference Include="PublicApiGenerator" Version="11.0.0" />
-        <PackageReference Include="Verify.Xunit" Version="20.8.2" />
+        <PackageReference Include="Verify.Xunit" Version="21.0.0" />
         <PackageReference Include="Verify.DiffPlex" Version="2.2.1" />
     </ItemGroup>