Update magic number

Lib/importlib/_bootstrap_external.py

@@ -456,6 +456,7 @@ def _write_atomic(path, data, mode=0o666):
 #     Python 3.13a1 3558 (Reorder the stack items for CALL)
 #     Python 3.13a1 3559 (Generate opcode IDs from bytecodes.c)
 #     Python 3.13a1 3560 (Add RESUME_CHECK instruction)
+#     Python 3.13a1 3561 (Add cache entry to branch instructions)
 
 #     Python 3.14 will start with 3600
 
@@ -472,7 +473,7 @@ def _write_atomic(path, data, mode=0o666):
 # Whenever MAGIC_NUMBER is changed, the ranges in the magic_values array
 # in PC/launcher.c must also be updated.
 
-MAGIC_NUMBER = (3560).to_bytes(2, 'little') + b'\r\n'
+MAGIC_NUMBER = (3561).to_bytes(2, 'little') + b'\r\n'
 
 _RAW_MAGIC_NUMBER = int.from_bytes(MAGIC_NUMBER, 'little')  # For import.c