C#: Update TaintTrackingPath test expected output.

Author: michaelnebel

csharp/ql/test/library-tests/dataflow/global/TaintTrackingPath.expected

@@ -22,7 +22,7 @@ models
 | 21 | Summary: System; Int32; false; TryParse; (System.String,System.Globalization.NumberStyles,System.IFormatProvider,System.Int32); ; Argument[0]; Argument[3]; taint; manual |
 | 22 | Summary: System; Int32; false; TryParse; (System.String,System.Int32); ; Argument[0]; Argument[1]; taint; manual |
 | 23 | Summary: System; Lazy<T>; false; Lazy; (System.Func<T>); ; Argument[0].ReturnValue; Argument[this].Property[System.Lazy`1.Value]; value; manual |
-| 24 | Summary: System; String; false; Join; (System.String,System.String[]); ; Argument[1].Element; ReturnValue; taint; manual |
+| 24 | Summary: System; String; false; Join; (System.String,System.ReadOnlySpan<System.String>); ; Argument[1].Element; ReturnValue; taint; manual |
 edges
 | Capture.cs:7:20:7:26 | tainted : String | Capture.cs:14:9:14:18 | access to local function CaptureIn1 : CaptureIn1 [captured tainted] : String | provenance |  |
 | Capture.cs:7:20:7:26 | tainted : String | Capture.cs:25:9:25:18 | access to local function CaptureIn2 : CaptureIn2 [captured tainted] : String | provenance |  |