Update heatmap fixtures to restore tests (#13224) (#13226)

`the hotfix day`

integrations/api_user_heatmap_test.go

 	var heatmap []*models.UserHeatmapData
 	DecodeJSON(t, resp, &heatmap)
 	var dummyheatmap []*models.UserHeatmapData
-	dummyheatmap = append(dummyheatmap, &models.UserHeatmapData{Timestamp: 1571616000, Contributions: 1})
+	dummyheatmap = append(dummyheatmap, &models.UserHeatmapData{Timestamp: 1603152000, Contributions: 1})
 
 	assert.Equal(t, dummyheatmap, heatmap)
 }

models/fixtures/action.yml

   act_user_id: 2
   repo_id: 2
   is_private: true
-  created_unix: 1571686356
+  created_unix: 1603228283
 
 -
   id: 2

models/user_heatmap_test.go

 		CountResult int
 		JSONResult  string
 	}{
-		{2, 1, `[{"timestamp":1571616000,"contributions":1}]`},
+		{2, 1, `[{"timestamp":1603152000,"contributions":1}]`},
 		{3, 0, `[]`},
 	}
 	// Prepare