chore(deps): Update dependency Grpc.Tools to 2.71.0 (#64)

This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [Grpc.Tools](https://redirect.github.com/grpc/grpc) | `2.70.0` ->
`2.71.0` |
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|
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|
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|
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|

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source/Dgraph/Dgraph.csproj

@@ -22,7 +22,7 @@
     <PackageReference Include="Google.Protobuf" Version="3.30.1" />
     <PackageReference Include="Grpc.Core" Version="2.46.6" />
     <PackageReference Include="Grpc.Net.Client" Version="2.70.0" />
-    <PackageReference Include="Grpc.Tools" Version="2.70.0" PrivateAssets="All" />
+    <PackageReference Include="Grpc.Tools" Version="2.71.0" PrivateAssets="All" />
     <PackageReference Include="FluentResults" Version="3.16.0" />
   </ItemGroup>