Bump gherkin from 29.0.0 to 30.0.4 in /gremlin-dotnet

Bumps [gherkin](https://github.com/cucumber/gherkin) from 29.0.0 to 30.0.4.
- [Release notes](https://github.com/cucumber/gherkin/releases)
- [Changelog](https://github.com/cucumber/gherkin/blob/main/CHANGELOG.md)
- [Commits](cucumber/gherkin@v29.0.0...v30.0.4)

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

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

gremlin-dotnet/test/Gremlin.Net.IntegrationTest/Gremlin.Net.IntegrationTest.csproj

@@ -15,7 +15,7 @@
     <ProjectReference Include="..\..\src\Gremlin.Net\Gremlin.Net.csproj" />
   </ItemGroup>
   <ItemGroup>
-    <PackageReference Include="gherkin" Version="29.0.0" />
+    <PackageReference Include="gherkin" Version="30.0.4" />
     <PackageReference Include="Microsoft.Extensions.Logging.Console" Version="8.0.0" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.11.1" />
     <PackageReference Include="NSubstitute" Version="5.1.0" />