Prefer to use Bang operator

Author: rafaelsc

src/Serilog.Sinks.Console/Sinks/SystemConsole/Output/EventPropertyTokenRenderer.cs

@@ -62,7 +62,7 @@ public override void Render(LogEvent logEvent, TextWriter output)
 
                 if (_token.Alignment.HasValue)
                 {
-                    var str = writer.ToString() ?? throw new InvalidOperationException("The output TextWriter, return a invalid state.");
+                    var str = writer.ToString()!;
                     Padding.Apply(output, str, _token.Alignment);
                 }
             }