Bump Verify.Xunit from 21.2.0 to 21.3.0

Bumps [Verify.Xunit](https://github.com/VerifyTests/Verify) from 21.2.0 to 21.3.0.
- [Release notes](https://github.com/VerifyTests/Verify/releases)
- [Commits](https://github.com/VerifyTests/Verify/commits/21.3.0)

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

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

test/Microsoft.OpenApi.Tests/Microsoft.OpenApi.Tests.csproj

@@ -28,7 +28,7 @@
     <PackageReference Include="Moq" Version="4.20.69" />
     <PackageReference Include="Newtonsoft.Json" Version="13.0.3" />
     <PackageReference Include="SharpYaml" Version="2.1.0" />
-    <PackageReference Include="Verify.Xunit" Version="21.2.0" />
+    <PackageReference Include="Verify.Xunit" Version="21.3.0" />
     <PackageReference Include="xunit" Version="2.5.1" />
     <PackageReference Include="xunit.runner.visualstudio" Version="2.5.1">
       <PrivateAssets>all</PrivateAssets>