bump the bytecode magic number (GH-25225)

diff --git a/Python/importlib_external.h b/Python/importlib_external.h
index a9a1f4d..62e5239 100644
--- a/Python/importlib_external.h
+++ b/Python/importlib_external.h
@@ -315,7 +315,7 @@ const unsigned char _Py_M__importlib_bootstrap_external[] = {
     99,152,0,0,0,115,38,0,0,0,16,5,6,1,22,1,
     4,255,2,2,14,3,24,1,16,128,18,1,12,1,2,1,
     12,1,2,3,12,254,2,1,2,1,2,254,2,253,255,128,
-    114,83,0,0,0,105,107,13,0,0,114,44,0,0,0,114,
+    114,83,0,0,0,105,108,13,0,0,114,44,0,0,0,114,
     32,0,0,0,115,2,0,0,0,13,10,90,11,95,95,112,
     121,99,97,99,104,101,95,95,122,4,111,112,116,45,122,3,
     46,112,121,122,4,46,112,121,119,122,4,46,112,121,99,41,