`codesign --deep` is deprecated and should be removed

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Describe the bug

From man codesign:

     --deep  (DEPRECATED for signing as of macOS 13.0) When signing a bundle, specifies that nested code content such as helpers,
             frameworks, and plug-ins, should be recursively signed in turn.
             Beware:

followed by a whole bunch of caveats. Any embedded bundles still need to be signed after signing all of their contents individually, but --deep just isn't that useful of an option; it's quite limited and anywhere that briefcase isn't finding the right stuff to sign that's a bug on its own and should be fixed.

Steps to reproduce

N/A

Expected behavior

don't use --deep

Screenshots

No response

Environment

N/A

Logs

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Additional context

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