Bump Verify.Xunit from 21.0.0 to 21.1.1 (#573)

Bumps [Verify.Xunit](https://github.com/VerifyTests/Verify) from 21.0.0 to 21.1.1.
- [Release notes](https://github.com/VerifyTests/Verify/releases)
- [Commits](VerifyTests/Verify@21.0.0...21.1.1)

---
updated-dependencies:
- dependency-name: Verify.Xunit
  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/Docs/Docs.csproj

@@ -8,7 +8,7 @@
  <PackageReference Include="xunit.runner.visualstudio" Version="2.5.0" />
  <PackageReference Include="Xunit" Version="2.5.0" />
  <PackageReference Include="XunitContext" Version="3.3.1" />
- <PackageReference Include="Verify.Xunit" Version="21.0.0" />
+ <PackageReference Include="Verify.Xunit" Version="21.1.1" />
  <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.7.2" />
  </ItemGroup>
 </Project>