chore: add new bbr implementation

transport/tuic/congestion_v2/minmax_go121.go

@@ -0,0 +1,13 @@
+//go:build go1.21
+
+package congestion
+
+import "cmp"
+
+func Max[T cmp.Ordered](a, b T) T {
+	return max(a, b)
+}
+
+func Min[T cmp.Ordered](a, b T) T {
+	return min(a, b)
+}