chore(deps): update dependency grpc.tools to v2.64.0 (#207)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

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

@@ -32,7 +32,7 @@
     <Protobuf Include="schemas\protobuf\flagd\sync\v1\sync.proto" GrpcServices="Client" />
     <PackageReference Include="Google.Protobuf" Version="3.27.1" />
     <PackageReference Include="Grpc.Net.Client" Version="2.63.0" />
-    <PackageReference Include="Grpc.Tools" Version="2.63.0">
+    <PackageReference Include="Grpc.Tools" Version="2.64.0">
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
       <PrivateAssets>all</PrivateAssets>
     </PackageReference>