Resolve potential XSS concerns from scanners in SignalR (#57180)

Author: BrennanConroy

src/SignalR/common/Http.Connections/src/Internal/HttpConnectionDispatcher.cs

@@ -344,7 +344,7 @@ private async Task ProcessNegotiate(HttpContext context, HttpConnectionDispatche
             var queryStringVersionValue = queryStringVersion.ToString();
             if (!int.TryParse(queryStringVersionValue, out clientProtocolVersion))
             {
-                error = $"The client requested an invalid protocol version '{queryStringVersionValue}'";
+                error = $"The client requested a non-integer protocol version.";
                 Log.InvalidNegotiateProtocolVersion(_logger, queryStringVersionValue);
             }
             else if (clientProtocolVersion < options.MinimumProtocolVersion)

src/SignalR/common/Http.Connections/test/HttpConnectionDispatcherTests.cs

@@ -159,7 +159,7 @@ public async Task InvalidNegotiateProtocolVersionThrows()
             var negotiateResponse = JsonConvert.DeserializeObject<JObject>(Encoding.UTF8.GetString(ms.ToArray()));
 
             var error = negotiateResponse.Value<string>("error");
-            Assert.Equal("The client requested an invalid protocol version 'Invalid'", error);
+            Assert.Equal("The client requested a non-integer protocol version.", error);
 
             var connectionId = negotiateResponse.Value<string>("connectionId");
             Assert.Null(connectionId);