Fixed in-operation

[drfho]

To avoid an error like:

  File "/home/zope/vpy313/lib/python3.13/site-packages/Products/mcdutils/mapping.py", line 69, in __repr__
    if 'passw' in key.lower():
       ^^^^^^^^^^^^^^^^^^^^^^
TypeError: a bytes-like object is required, not 'str'

we may to force the key into string-type before applying the in-operator.

[dataflake]

Just released version 5.1 with the fix.