chore(deps): Update dependency Google.Protobuf to 3.30.2 (#66)

This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
|
[Google.Protobuf](https://redirect.github.com/protocolbuffers/protobuf)
| `3.30.1` -> `3.30.2` |
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|
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|
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|
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source/Dgraph/Dgraph.csproj

@@ -19,7 +19,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Google.Protobuf" Version="3.30.1" />
+    <PackageReference Include="Google.Protobuf" Version="3.30.2" />
     <PackageReference Include="Grpc.Core" Version="2.46.6" />
     <PackageReference Include="Grpc.Net.Client" Version="2.70.0" />
     <PackageReference Include="Grpc.Tools" Version="2.71.0" PrivateAssets="All" />