Remove public modifier from _dispatcher field in LspConnection (typo).

Author: tintoy

src/Client/Protocol/LspConnection.cs

@@ -103,7 +103,7 @@ public sealed class LspConnection
         /// <summary>
         ///     The <see cref="LspDispatcher"/> used to dispatch messages to handlers.
         /// </summary>
-        public LspDispatcher _dispatcher;
+        LspDispatcher _dispatcher;
 
         /// <summary>
         ///     A <see cref="Task"/> representing the connection's receive loop.