Fix reversed expected/actual. (dotnet#36005)

Author: adityamandaleeka

src/Servers/Kestrel/shared/test/Http3/Http3InMemory.cs

@@ -255,7 +255,7 @@ public static void AssertFrameType(Http3FrameType actual, Http3FrameType expecte
         {
             if (actual != expected)
             {
-                throw new InvalidOperationException($"Expected {actual} frame. Got {expected}.");
+                throw new InvalidOperationException($"Expected {expected} frame. Got {actual}.");
             }
         }