Close #13007: whichdb should recognize gdbm 1.9 magic numbers

Lib/dbm/__init__.py

@@ -166,7 +166,7 @@ def whichdb(filename):
         return ""
 
     # Check for GNU dbm
-    if magic == 0x13579ace:
+    if magic in (0x13579ace, 0x13579acd, 0x13579acf):
         return "dbm.gnu"
 
     # Later versions of Berkeley db hash file have a 12-byte pad in

Misc/NEWS

@@ -55,6 +55,8 @@ Library
 - Issue #11657: Fix sending file descriptors over 255 over a multiprocessing
   Pipe.
 
+- Issue #13007: whichdb should recognize gdbm 1.9 magic numbers.
+
 - Issue #12213: Fix a buffering bug with interleaved reads and writes that
   could appear on BufferedRandom streams.