Update Grpc.Net.Client version to 2.71.0.

Fixes #178

Author: bingnz

src/Serilog.Sinks.OpenTelemetry/Serilog.Sinks.OpenTelemetry.csproj

@@ -38,7 +38,7 @@
         <None Include="../../assets/serilog-sink-nuget.png" Pack="true" Visible="false" PackagePath="/" />
         <None Include="../../README.md" Pack="true" Visible="false" PackagePath="/" />
         <PackageReference Include="Google.Protobuf" Version="3.30.1" />
-        <PackageReference Include="Grpc.Net.Client" Version="2.70.0" />
+        <PackageReference Include="Grpc.Net.Client" Version="2.71.0" />
         <PackageReference Include="Serilog" Version="4.2.0" />
     </ItemGroup>
 </Project>