bpo-35224: Bump the pyc magic number by 1 instead of by 10 in last modification (GH-14320)

diff --git a/Python/importlib_external.h b/Python/importlib_external.h
index 01a3c8b..33b2ca6 100644
--- a/Python/importlib_external.h
+++ b/Python/importlib_external.h
@@ -278,7 +278,7 @@
     95,97,116,111,109,105,99,120,0,0,0,115,30,0,0,0,
     0,5,16,1,6,1,16,0,6,255,4,2,2,3,14,1,
     20,1,16,1,14,1,2,1,14,1,14,1,6,1,114,69,
-    0,0,0,105,92,13,0,0,114,28,0,0,0,114,16,0,
+    0,0,0,105,83,13,0,0,114,28,0,0,0,114,16,0,
     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,
     121,122,4,46,112,121,99,78,41,1,218,12,111,112,116,105,