Bump Grpc.Tools from 2.76.0 to 2.78.0

---
updated-dependencies:
- dependency-name: Grpc.Tools
  dependency-version: 2.78.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

src/xAI.Protocol/xAI.Protocol.csproj

@@ -17,7 +17,7 @@
     <PackageReference Include="Google.Protobuf" Version="3.33.2" />
     <PackageReference Include="Grpc.Net.Client" Version="2.71.0" />
     <PackageReference Include="Grpc.Net.ClientFactory" Version="2.71.0" />
-    <PackageReference Include="Grpc.Tools" Version="2.76.0" PrivateAssets="all" />
+    <PackageReference Include="Grpc.Tools" Version="2.78.0" PrivateAssets="all" />
     <PackageReference Include="Microsoft.Extensions.DependencyInjection.Abstractions" Version="10.0.3" />
   </ItemGroup>