Fix `vertex/t75` layout coordinates (#25736)

Updated the Y value for row 5. Before they were set to row 4 as well, which caused qmk configurator to overlap rows 4 and 5.

keyboards/vertex/t75/keyboard.json

@@ -103,15 +103,15 @@
                 {"matrix": [4, 11], "x": 12.25, "y": 4, "w": 1.75},
                 {"matrix": [4, 12], "x": 14, "y": 4},
                 {"matrix": [4, 13], "x": 15, "y": 4},
-                {"matrix": [5, 0], "x": 0, "y": 4, "w": 1.25},
-                {"matrix": [5, 1], "x": 1.25, "y": 4, "w": 1.25},
-                {"matrix": [5, 2], "x": 2.5, "y": 4, "w": 1.25},
-                {"matrix": [5, 5], "x": 3.75, "y": 4, "w": 6.25},
-                {"matrix": [5, 9], "x": 10, "y": 4, "w": 1.25},
-                {"matrix": [5, 10], "x": 11.25, "y": 4, "w": 1.25},
-                {"matrix": [5, 11], "x": 13, "y": 4},
-                {"matrix": [5, 12], "x": 14, "y": 4},
-                {"matrix": [5, 13], "x": 15, "y": 4}
+                {"matrix": [5, 0], "x": 0, "y": 5, "w": 1.25},
+                {"matrix": [5, 1], "x": 1.25, "y": 5, "w": 1.25},
+                {"matrix": [5, 2], "x": 2.5, "y": 5, "w": 1.25},
+                {"matrix": [5, 5], "x": 3.75, "y": 5, "w": 6.25},
+                {"matrix": [5, 9], "x": 10, "y": 5, "w": 1.25},
+                {"matrix": [5, 10], "x": 11.25, "y": 5, "w": 1.25},
+                {"matrix": [5, 11], "x": 13, "y": 5},
+                {"matrix": [5, 12], "x": 14, "y": 5},
+                {"matrix": [5, 13], "x": 15, "y": 5}
             ]
         }
     }