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fix: feature-detect getaddresses(strict=) so address parsing works on Python < 3.13 (#161)

* fix(get_addresses): feature-detect getaddresses(strict=) for Python < 3.13

email.utils.getaddresses only gained the ``strict`` keyword in Python 3.13
(backported to later 3.9-3.12 security patch releases). mail-parser targets
``requires-python >=3.9,<3.15``, so on an earlier patch release (e.g. CPython
3.11.3) get_addresses raised:

    TypeError: getaddresses() got an unexpected keyword argument 'strict'

which made downstream callers (e.g. parsedmarc) treat valid messages as
invalid. Detect whether ``strict`` is supported via inspect.signature and only
pass it when available, falling back to the default call otherwise.

Adds a regression test that simulates a pre-3.13 getaddresses and asserts the
address is parsed instead of crashing.

* fix(get_addresses): implement feature detection for strict parsing in getaddresses

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Co-authored-by: Fedele Mantuano <mantuano.fedele@gmail.com>

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