[MacPorts] #63930: py-keyring doesn't work at python3.10

[MacPorts]

#63930: py-keyring doesn't work at python3.10
--------------------+--------------------
 Reporter:  catap   |      Owner:  (none)
     Type:  defect  |     Status:  new
 Priority:  Normal  |  Milestone:
Component:  ports   |    Version:
 Keywords:          |       Port:
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 {{{
 Python 3.10.0 (default, Nov 12 2021, 12:32:57) [Clang 12.0.5
 (clang-1205.0.22.11)] on darwin
 Type "help", "copyright", "credits" or "license" for more information.
 >>> import keyring
 Traceback (most recent call last):
   File "<stdin>", line 1, in <module>
   File
 "/opt/local/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10
 /site-packages/keyring/__init__.py", line 1, in <module>
     from .core import (
   File
 "/opt/local/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10
 /site-packages/keyring/core.py", line 11, in <module>
     from . import backend, credentials
   File
 "/opt/local/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10
 /site-packages/keyring/backend.py", line 12, in <module>
     import importlib_metadata as metadata
 ModuleNotFoundError: No module named 'importlib_metadata'
 >>>
 }}}

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Ticket URL: <https://trac.macports.org/ticket/63930>
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