Merge pull request #1 from fidelity/Fix-issue-3149

Fix issue- #3149

src/OpenTelemetry.Instrumentation.GrpcCore/ServerTracingInterceptor.cs

@@ -166,7 +166,7 @@ private class ServerRpcScope<TRequest, TResponse> : RpcScope<TRequest, TResponse
                 for (var i = 0; i < metadata.Count; i++)
                 {
                     var entry = metadata[i];
-                    if (entry.Key.Equals(key))
+                   if (string.Equals(entry.Key, key, StringComparison.OrdinalIgnoreCase))
                     {
                         return new string[1] { entry.Value };
                     }