test-demandimport: match upper-case hexadecimal

tests/test-demandimport

@@ -8,7 +8,7 b' import re'
 rsub = re.sub
 def f(obj):
     l = repr(obj)
-    l = rsub("0x[0-9a-f]+", "0x?", l)
+    l = rsub("0x[0-9a-fA-F]+", "0x?", l)
     l = rsub("from '.*'", "from '?'", l)
     return l