Bump Polly from 8.3.1 to 8.4.0 in /gremlin-dotnet

Bumps [Polly](https://github.com/App-vNext/Polly) from 8.3.1 to 8.4.0.
- [Release notes](https://github.com/App-vNext/Polly/releases)
- [Changelog](https://github.com/App-vNext/Polly/blob/main/CHANGELOG.md)
- [Commits](App-vNext/Polly@8.3.1...8.4.0)

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

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

gremlin-dotnet/src/Gremlin.Net/Gremlin.Net.csproj

@@ -74,7 +74,7 @@ NOTE that versions suffixed with "-rc" are considered release candidates (i.e. p
     <PackageReference Include="Microsoft.Extensions.Logging.Abstractions" Version="8.0.1" />
     <PackageReference Include="Microsoft.SourceLink.GitHub" Version="8.0.0" PrivateAssets="All" />
     <PackageReference Include="System.Text.Json" Version="8.0.3" />
-    <PackageReference Include="Polly" Version="8.3.1" />
+    <PackageReference Include="Polly" Version="8.4.0" />
   </ItemGroup>
 
   <ItemGroup Condition="'$(TargetFramework)' == 'netstandard2.0'">