Merge pull request #24359 from asmorkalov:as/FastNeuralStyle_eccv16_tuning

Tuned threshold for FastNeuralStyle_eccv16 test

modules/dnn/test/test_backends.cpp

@@ -531,7 +531,7 @@ TEST_P(DNNTestNetwork, FastNeuralStyle_eccv16)
     Mat img = imread(findDataFile("dnn/googlenet_1.png"));
     Mat inp = blobFromImage(img, 1.0, Size(320, 240), Scalar(103.939, 116.779, 123.68), false, false);
     // Output image has values in range [-143.526, 148.539].
-    float l1 = 2e-4, lInf = 2e-3;
+    float l1 = 2e-4, lInf = 2.4e-3;
     if (target == DNN_TARGET_OPENCL_FP16 || target == DNN_TARGET_MYRIAD)
     {
         l1 = 0.4;