fix possible RegexMatchTimeoutException

6bda890 introduced a
Timeout on RegEx compilation. We hit this timeout
a few times since this change.

Removed the timeout so it uses the default like
before.

src/Microsoft.OpenApi/Validations/Rules/OpenApiPathsRules.cs

@@ -36,7 +36,7 @@ public static class OpenApiPathsRules
                     }
                 });
 
-        private static readonly Regex regexPath = new Regex("\\{([^/]+)\\}", RegexOptions.Compiled, TimeSpan.FromMilliseconds(100));
+        private static readonly Regex regexPath = new Regex("\\{([^/]+)\\}", RegexOptions.Compiled);
         /// <summary>
         /// A relative path to an individual endpoint. The field name MUST begin with a slash.
         /// </summary>