chore(deps): update dependency grpc.tools to 2.68.1

Author: renovate[bot]

src/OpenFeature.Contrib.Providers.Flagd/OpenFeature.Contrib.Providers.Flagd.csproj

@@ -29,7 +29,7 @@
     <Protobuf Include="schemas\protobuf\flagd\sync\v1\sync.proto" GrpcServices="Client" />
     <PackageReference Include="Google.Protobuf" Version="3.28.2" />
     <PackageReference Include="Grpc.Net.Client" Version="2.66.0" />
-    <PackageReference Include="Grpc.Tools" Version="2.66.0">
+    <PackageReference Include="Grpc.Tools" Version="2.68.1">
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
       <PrivateAssets>all</PrivateAssets>
     </PackageReference>