allow LINE_PINxx for Teensy 4.x pins (#13247)

fixes https://github.com/qmk/qmk_firmware/issues/13052

data/schemas/keyboard.jsonschema

@@ -179,6 +179,10 @@
                                     "type": "string",
                                     "pattern": "^[A-K]\\d{1,2}$"
                                 },
+                                {
+                                    "type": "string",
+                                    "pattern": "^LINE_PIN\\d{1,2}$"
+                                },
                                 {
                                     "type": "number",
                                     "multipleOf": 1
@@ -198,6 +202,10 @@
                                 "type": "string",
                                 "pattern": "^[A-K]\\d{1,2}$"
                             },
+                            {
+                                "type": "string",
+                                "pattern": "^LINE_PIN\\d{1,2}$"
+                            },
                             {
                                 "type": "number",
                                 "multipleOf": 1
@@ -216,6 +224,10 @@
                                 "type": "string",
                                 "pattern": "^[A-K]\\d{1,2}$"
                             },
+                            {
+                                "type": "string",
+                                "pattern": "^LINE_PIN\\d{1,2}$"
+                            },
                             {
                                 "type": "number",
                                 "multipleOf": 1
@@ -261,7 +273,7 @@
                 },
                 "pin": {
                     "type": "string",
-                    "pattern": "^[A-K]\\d{1,2}$"
+                    "pattern": "^([A-K]\\d{1,2}|LINE_PIN\\d{1,2})$"
                 },
                 "saturation_steps": {
                     "type": "number",

lib/python/qmk/info.py

@@ -146,6 +146,9 @@ def _pin_name(pin):
     elif pin[0] in 'ABCDEFGHIJK' and pin[1].isdigit():
         return pin
 
+    elif pin.startswith('LINE_PIN'):
+        return pin
+
     raise ValueError(f'Invalid pin: {pin}')